13761621 has 6 divisors (see below), whose sum is σ = 19877910. Its totient is φ = 9174408.

The previous prime is 13761617. The next prime is 13761667. The reversal of 13761621 is 12616731.

13761621 is a `hidden beast` number, since 1 + 37 + 6 + 1 + 621 = 666.

13761621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 34596 = 3705^2 + 186^2 .

It is not a de Polignac number, because 13761621 - 2² = 13761617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13761221) 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, 764526 + ... + 764543.

It is an arithmetic number, because the mean of its divisors is an integer number (3312985).

Almost surely, 2^13761621 is an apocalyptic number.

It is an amenable number.

13761621 is a deficient number, since it is larger than the sum of its proper divisors (6116289).

13761621 is a wasteful number, since it uses less digits than its factorization.

13761621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1529075 (or 1529072 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 13761621 is about 3709.6658879204. The cubic root of 13761621 is about 239.6384660786.

The spelling of 13761621 in words is "thirteen million, seven hundred sixty-one thousand, six hundred twenty-one".