138901995 has 12 divisors (see below), whose sum is σ = 240763536. Its totient is φ = 74081040.

The previous prime is 138901901. The next prime is 138902003. The reversal of 138901995 is 599109831.

It is not a de Polignac number, because 138901995 - 2²⁵ = 105347563 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 3086711 = 138901995 / (1 + 3 + 8 + 9 + 0 + 1 + 9 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 138901995.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1543311 + ... + 1543400.

It is an arithmetic number, because the mean of its divisors is an integer number (20063628).

Almost surely, 2^138901995 is an apocalyptic number.

138901995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138901995 is a deficient number, since it is larger than the sum of its proper divisors (101861541).

138901995 is a wasteful number, since it uses less digits than its factorization.

138901995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086722 (or 3086719 counting only the distinct ones).

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

The square root of 138901995 is about 11785.6690518612. The cubic root of 138901995 is about 517.8883733071. Note that the first 3 decimals are identical.

The spelling of 138901995 in words is "one hundred thirty-eight million, nine hundred one thousand, nine hundred ninety-five".