138807655 has 32 divisors (see below), whose sum is σ = 196416000. Its totient is φ = 92195712.

The previous prime is 138807649. The next prime is 138807671. The reversal of 138807655 is 556708831.

It is not a de Polignac number, because 138807655 - 2⁷ = 138807527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223936 + ... + 224554.

It is an arithmetic number, because the mean of its divisors is an integer number (6138000).

Almost surely, 2^138807655 is an apocalyptic number.

138807655 is a deficient number, since it is larger than the sum of its proper divisors (57608345).

138807655 is a wasteful number, since it uses less digits than its factorization.

138807655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 138807655 is about 11781.6660536615. Note that the first 3 decimals coincide. The cubic root of 138807655 is about 517.7710996029.

The spelling of 138807655 in words is "one hundred thirty-eight million, eight hundred seven thousand, six hundred fifty-five".