138879555 has 16 divisors (see below), whose sum is σ = 223098624. Its totient is φ = 73772000.

The previous prime is 138879553. The next prime is 138879581. The reversal of 138879555 is 555978831.

It is not a de Polignac number, because 138879555 - 2¹ = 138879553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138879498 and 138879507.

It is not an unprimeable number, because it can be changed into a prime (138879553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14679 + ... + 22208.

It is an arithmetic number, because the mean of its divisors is an integer number (13943664).

Almost surely, 2^138879555 is an apocalyptic number.

138879555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138879555 is a deficient number, since it is larger than the sum of its proper divisors (84219069).

138879555 is a wasteful number, since it uses less digits than its factorization.

138879555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37146.

The product of its digits is 1512000, while the sum is 51.

The square root of 138879555 is about 11784.7170097546. The cubic root of 138879555 is about 517.8604830406.

The spelling of 138879555 in words is "one hundred thirty-eight million, eight hundred seventy-nine thousand, five hundred fifty-five".