13770639 has 6 divisors (see below), whose sum is σ = 19890936. Its totient is φ = 9180420.

The previous prime is 13770637. The next prime is 13770667. The reversal of 13770639 is 93607731.

13770639 is a `hidden beast` number, since 13 + 7 + 7 + 0 + 639 = 666.

It is not a de Polignac number, because 13770639 - 2¹ = 13770637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13770637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 765027 + ... + 765044.

It is an arithmetic number, because the mean of its divisors is an integer number (3315156).

Almost surely, 2^13770639 is an apocalyptic number.

13770639 is a deficient number, since it is larger than the sum of its proper divisors (6120297).

13770639 is a wasteful number, since it uses less digits than its factorization.

13770639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530077 (or 1530074 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 36.

The square root of 13770639 is about 3710.8811622039. The cubic root of 13770639 is about 239.6907997344.

The spelling of 13770639 in words is "thirteen million, seven hundred seventy thousand, six hundred thirty-nine".