13621426 has 16 divisors (see below), whose sum is σ = 25147584. Its totient is φ = 5388624.

The previous prime is 13621409. The next prime is 13621427. The reversal of 13621426 is 62412631.

13621426 = 341² + 342² + ... + 431².

It is a self number, because there is not a number n which added to its sum of digits gives 13621426.

It is not an unprimeable number, because it can be changed into a prime (13621427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37240 + ... + 37603.

It is an arithmetic number, because the mean of its divisors is an integer number (1571724).

Almost surely, 2^13621426 is an apocalyptic number.

13621426 is a deficient number, since it is larger than the sum of its proper divisors (11526158).

13621426 is a wasteful number, since it uses less digits than its factorization.

13621426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74865.

The product of its digits is 1728, while the sum is 25.

The square root of 13621426 is about 3690.7216096585. The cubic root of 13621426 is about 238.8219234530.

The spelling of 13621426 in words is "thirteen million, six hundred twenty-one thousand, four hundred twenty-six".