138255804 has 36 divisors (see below), whose sum is σ = 353414880. Its totient is φ = 45566400.

The previous prime is 138255797. The next prime is 138255809. The reversal of 138255804 is 408552831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×138255804² = 38229334679372832, 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (138255809) 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, 18372 + ... + 24779.

It is an arithmetic number, because the mean of its divisors is an integer number (9817080).

Almost surely, 2^138255804 is an apocalyptic number.

It is an amenable number.

138255804 is an abundant number, since it is smaller than the sum of its proper divisors (215159076).

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

138255804 is a wasteful number, since it uses less digits than its factorization.

138255804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43250 (or 43245 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 138255804 is about 11758.2228249000. Note that the first 3 decimals coincide. The cubic root of 138255804 is about 517.0840289574.

The spelling of 138255804 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, eight hundred four".