1387238536 has 32 divisors (see below), whose sum is σ = 2658870360. Its totient is φ = 678292992.

The previous prime is 1387238533. The next prime is 1387238563. The reversal of 1387238536 is 6358327831.

It can be written as a sum of positive squares in 4 ways, for example, as 1260676036 + 126562500 = 35506^2 + 11250^2 .

It is not an unprimeable number, because it can be changed into a prime (1387238533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127486 + ... + 137938.

Almost surely, 2^1387238536 is an apocalyptic number.

It is an amenable number.

1387238536 is a deficient number, since it is larger than the sum of its proper divisors (1271631824).

1387238536 is a wasteful number, since it uses less digits than its factorization.

1387238536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10825 (or 10821 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The square root of 1387238536 is about 37245.6512360839. The cubic root of 1387238536 is about 1115.2794880756.

The spelling of 1387238536 in words is "one billion, three hundred eighty-seven million, two hundred thirty-eight thousand, five hundred thirty-six".