13779725 has 12 divisors (see below), whose sum is σ = 17549844. Its totient is φ = 10725120.

The previous prime is 13779719. The next prime is 13779757. The reversal of 13779725 is 52797731.

It can be written as a sum of positive squares in 6 ways, for example, as 1592644 + 12187081 = 1262^2 + 3491^2 .

It is not a de Polignac number, because 13779725 - 2⁴ = 13779709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6524 + ... + 8373.

It is an arithmetic number, because the mean of its divisors is an integer number (1462487).

Almost surely, 2^13779725 is an apocalyptic number.

It is an amenable number.

13779725 is a deficient number, since it is larger than the sum of its proper divisors (3770119).

13779725 is a wasteful number, since it uses less digits than its factorization.

13779725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14944 (or 14939 counting only the distinct ones).

The product of its digits is 92610, while the sum is 41.

The square root of 13779725 is about 3712.1051978628. The cubic root of 13779725 is about 239.7435049090.

The spelling of 13779725 in words is "thirteen million, seven hundred seventy-nine thousand, seven hundred twenty-five".