138774879 has 48 divisors (see below), whose sum is σ = 222842880. Its totient is φ = 82866240.

The previous prime is 138774871. The next prime is 138774943. The reversal of 138774879 is 978477831.

It is not a de Polignac number, because 138774879 - 2³ = 138774871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138774871) 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 47 ways as a sum of consecutive naturals, for example, 248869 + ... + 249425.

It is an arithmetic number, because the mean of its divisors is an integer number (4642560).

Almost surely, 2^138774879 is an apocalyptic number.

138774879 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138774879 is a deficient number, since it is larger than the sum of its proper divisors (84068001).

138774879 is a wasteful number, since it uses less digits than its factorization.

138774879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 657 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 138774879 is about 11780.2749967902. The cubic root of 138774879 is about 517.7303434418.

The spelling of 138774879 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, eight hundred seventy-nine".