13672521 has 6 divisors (see below), whose sum is σ = 19749210. Its totient is φ = 9115008.

The previous prime is 13672517. The next prime is 13672531. The reversal of 13672521 is 12527631.

It is a happy number.

13672521 is a `hidden beast` number, since 136 + 7 + 2 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6969600 + 6702921 = 2640^2 + 2589^2 .

It is not a de Polignac number, because 13672521 - 2² = 13672517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13672531) 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, 759576 + ... + 759593.

It is an arithmetic number, because the mean of its divisors is an integer number (3291535).

Almost surely, 2^13672521 is an apocalyptic number.

It is an amenable number.

13672521 is a deficient number, since it is larger than the sum of its proper divisors (6076689).

13672521 is a wasteful number, since it uses less digits than its factorization.

13672521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519175 (or 1519172 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 13672521 is about 3697.6372185492. The cubic root of 13672521 is about 239.1201638933.

The spelling of 13672521 in words is "thirteen million, six hundred seventy-two thousand, five hundred twenty-one".