13406621 has 4 divisors (see below), whose sum is σ = 13437600. Its totient is φ = 13375644.

The previous prime is 13406599. The next prime is 13406651. The reversal of 13406621 is 12660431.

It is a happy number.

13406621 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13406621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13406651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14831 + ... + 15708.

It is an arithmetic number, because the mean of its divisors is an integer number (3359400).

Almost surely, 2^13406621 is an apocalyptic number.

It is an amenable number.

13406621 is a deficient number, since it is larger than the sum of its proper divisors (30979).

13406621 is an equidigital number, since it uses as much as digits as its factorization.

13406621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30978.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 13406621 is about 3661.5052915434. The cubic root of 13406621 is about 237.5598873908.

The spelling of 13406621 in words is "thirteen million, four hundred six thousand, six hundred twenty-one".