1238161536 has 96 divisors (see below), whose sum is σ = 3569817420. Its totient is φ = 411924480.

The previous prime is 1238161499. The next prime is 1238161537. The reversal of 1238161536 is 6351618321.

1238161536 is a `hidden beast` number, since 1 + 2 + 3 + 8 + 1 + 615 + 36 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1137038400 + 101123136 = 33720^2 + 10056^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1238161536.

It is not an unprimeable number, because it can be changed into a prime (1238161537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1166446 + ... + 1167506.

Almost surely, 2^1238161536 is an apocalyptic number.

1238161536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1238161536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1784908710).

1238161536 is an abundant number, since it is smaller than the sum of its proper divisors (2331655884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1238161536 is a wasteful number, since it uses less digits than its factorization.

1238161536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094 (or 2079 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1238161536 is about 35187.5196056784. The cubic root of 1238161536 is about 1073.8058594395.

Adding to 1238161536 its reverse (6351618321), we get a palindrome (7589779857).

The spelling of 1238161536 in words is "one billion, two hundred thirty-eight million, one hundred sixty-one thousand, five hundred thirty-six".