138910995 has 72 divisors (see below), whose sum is σ = 269601696. Its totient is φ = 65926656.

The previous prime is 138910979. The next prime is 138910997. The reversal of 138910995 is 599019831.

It is not a de Polignac number, because 138910995 - 2⁴ = 138910979 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 138910995.

It is not an unprimeable number, because it can be changed into a prime (138910997) 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 71 ways as a sum of consecutive naturals, for example, 275914 + ... + 276416.

It is an arithmetic number, because the mean of its divisors is an integer number (3744468).

Almost surely, 2^138910995 is an apocalyptic number.

138910995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138910995 is a deficient number, since it is larger than the sum of its proper divisors (130690701).

138910995 is a wasteful number, since it uses less digits than its factorization.

138910995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 138910995 is about 11786.0508653238. The cubic root of 138910995 is about 517.8995583989.

The spelling of 138910995 in words is "one hundred thirty-eight million, nine hundred ten thousand, nine hundred ninety-five".