138962139 has 8 divisors (see below), whose sum is σ = 185746512. Its totient is φ = 92409600.

The previous prime is 138962107. The next prime is 138962147. The reversal of 138962139 is 931269831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138962139 - 2⁵ = 138962107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138962139.

It is not an unprimeable number, because it can be changed into a prime (138962189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56554 + ... + 58959.

It is an arithmetic number, because the mean of its divisors is an integer number (23218314).

Almost surely, 2^138962139 is an apocalyptic number.

138962139 is a deficient number, since it is larger than the sum of its proper divisors (46784373).

138962139 is a wasteful number, since it uses less digits than its factorization.

138962139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115917.

The product of its digits is 69984, while the sum is 42.

The square root of 138962139 is about 11788.2203491452. The cubic root of 138962139 is about 517.9631103756.

The spelling of 138962139 in words is "one hundred thirty-eight million, nine hundred sixty-two thousand, one hundred thirty-nine".