139905477 has 6 divisors (see below), whose sum is σ = 202085702. Its totient is φ = 93270312.

The previous prime is 139905463. The next prime is 139905497. The reversal of 139905477 is 774509931.

139905477 is a `hidden beast` number, since 13 + 9 + 90 + 547 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 129754881 + 10150596 = 11391^2 + 3186^2 .

It is not a de Polignac number, because 139905477 - 2¹⁵ = 139872709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139905497) 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 5 ways as a sum of consecutive naturals, for example, 7772518 + ... + 7772535.

Almost surely, 2^139905477 is an apocalyptic number.

It is an amenable number.

139905477 is a deficient number, since it is larger than the sum of its proper divisors (62180225).

139905477 is a wasteful number, since it uses less digits than its factorization.

139905477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15545059 (or 15545056 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 139905477 is about 11828.1645659840. The cubic root of 139905477 is about 519.1325243231.

The spelling of 139905477 in words is "one hundred thirty-nine million, nine hundred five thousand, four hundred seventy-seven".