138926655 has 96 divisors (see below), whose sum is σ = 291852288. Its totient is φ = 59788800.

The previous prime is 138926653. The next prime is 138926657. The reversal of 138926655 is 556629831.

138926655 is a `hidden beast` number, since 1 + 389 + 266 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (138926653) and next prime (138926657).

It is not a de Polignac number, because 138926655 - 2¹ = 138926653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 138926655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138926653) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 400192 + ... + 400538.

It is an arithmetic number, because the mean of its divisors is an integer number (3040128).

Almost surely, 2^138926655 is an apocalyptic number.

138926655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138926655 is an abundant number, since it is smaller than the sum of its proper divisors (152925633).

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

138926655 is a wasteful number, since it uses less digits than its factorization.

138926655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 434 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 138926655 is about 11786.7151912651. The cubic root of 138926655 is about 517.9190193070.

The spelling of 138926655 in words is "one hundred thirty-eight million, nine hundred twenty-six thousand, six hundred fifty-five".