139408479 has 24 divisors (see below), whose sum is σ = 240252720. Its totient is φ = 79661232.

The previous prime is 139408471. The next prime is 139408501. The reversal of 139408479 is 974804931.

139408479 is a `hidden beast` number, since 139 + 40 + 8 + 479 = 666.

It is not a de Polignac number, because 139408479 - 2³ = 139408471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139408471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51364 + ... + 54009.

It is an arithmetic number, because the mean of its divisors is an integer number (10010530).

Almost surely, 2^139408479 is an apocalyptic number.

139408479 is a deficient number, since it is larger than the sum of its proper divisors (100844241).

139408479 is a wasteful number, since it uses less digits than its factorization.

139408479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105396 (or 105383 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 139408479 is about 11807.1367824719. The cubic root of 139408479 is about 518.5170755917.

The spelling of 139408479 in words is "one hundred thirty-nine million, four hundred eight thousand, four hundred seventy-nine".