138802536 has 24 divisors (see below), whose sum is σ = 375923730. Its totient is φ = 46267488.

The previous prime is 138802529. The next prime is 138802537. The reversal of 138802536 is 635208831.

It can be written as a sum of positive squares in only one way, i.e., 87048900 + 51753636 = 9330^2 + 7194^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×138802536² = 38532288000062592, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 138802536.

It is not an unprimeable number, because it can be changed into a prime (138802537) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 963835 + ... + 963978.

Almost surely, 2^138802536 is an apocalyptic number.

It is an amenable number.

138802536 is an abundant number, since it is smaller than the sum of its proper divisors (237121194).

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

138802536 is a wasteful number, since it uses less digits than its factorization.

138802536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927825 (or 1927818 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 138802536 is about 11781.4488073411. The cubic root of 138802536 is about 517.7647346733.

The spelling of 138802536 in words is "one hundred thirty-eight million, eight hundred two thousand, five hundred thirty-six".