138155610 has 32 divisors (see below), whose sum is σ = 332122752. Its totient is φ = 36780480.

The previous prime is 138155597. The next prime is 138155627. The reversal of 138155610 is 16551831.

138155610 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16347 + ... + 23313.

It is an arithmetic number, because the mean of its divisors is an integer number (10378836).

Almost surely, 2^138155610 is an apocalyptic number.

138155610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138155610 is an abundant number, since it is smaller than the sum of its proper divisors (193967142).

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

138155610 is a wasteful number, since it uses less digits than its factorization.

138155610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7638.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 138155610 is about 11753.9614598654. The cubic root of 138155610 is about 516.9590884824.

The spelling of 138155610 in words is "one hundred thirty-eight million, one hundred fifty-five thousand, six hundred ten".