139873477 has 2 divisors, whose sum is σ = 139873478. Its totient is φ = 139873476.

The previous prime is 139873471. The next prime is 139873493. The reversal of 139873477 is 774378931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127825636 + 12047841 = 11306^2 + 3471^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139873477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139873477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139873471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69936738 + 69936739.

It is an arithmetic number, because the mean of its divisors is an integer number (69936739).

Almost surely, 2^139873477 is an apocalyptic number.

It is an amenable number.

139873477 is a deficient number, since it is larger than the sum of its proper divisors (1).

139873477 is an equidigital number, since it uses as much as digits as its factorization.

139873477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 139873477 is about 11826.8117850924. The cubic root of 139873477 is about 519.0929416280.

The spelling of 139873477 in words is "one hundred thirty-nine million, eight hundred seventy-three thousand, four hundred seventy-seven".