1238853640 has 16 divisors (see below), whose sum is σ = 2787420780. Its totient is φ = 495541440.

The previous prime is 1238853619. The next prime is 1238853659. The reversal of 1238853640 is 463588321.

It can be written as a sum of positive squares in 2 ways, for example, as 1121044324 + 117809316 = 33482^2 + 10854^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 30971341 = 1238853640 / (1 + 2 + 3 + 8 + 8 + 5 + 3 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1238853593 and 1238853602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15485631 + ... + 15485710.

Almost surely, 2^1238853640 is an apocalyptic number.

1238853640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1238853640 is an abundant number, since it is smaller than the sum of its proper divisors (1548567140).

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

1238853640 is a wasteful number, since it uses less digits than its factorization.

1238853640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30971352 (or 30971348 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 1238853640 is about 35197.3527413639. The cubic root of 1238853640 is about 1074.0058998158.

The spelling of 1238853640 in words is "one billion, two hundred thirty-eight million, eight hundred fifty-three thousand, six hundred forty".