13959621 has 32 divisors (see below), whose sum is σ = 22592640. Its totient is φ = 8573040.

The previous prime is 13959599. The next prime is 13959629. The reversal of 13959621 is 12695931.

It is not a de Polignac number, because 13959621 - 2⁷ = 13959493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13959629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28186 + ... + 28676.

It is an arithmetic number, because the mean of its divisors is an integer number (706020).

Almost surely, 2^13959621 is an apocalyptic number.

It is an amenable number.

13959621 is a deficient number, since it is larger than the sum of its proper divisors (8633019).

13959621 is an frugal number, since it uses more digits than its factorization.

13959621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 507 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 13959621 is about 3736.2576195974. The cubic root of 13959621 is about 240.7822910657.

The spelling of 13959621 in words is "thirteen million, nine hundred fifty-nine thousand, six hundred twenty-one".