13620891 has 12 divisors (see below), whose sum is σ = 19168872. Its totient is φ = 8601984.

The previous prime is 13620889. The next prime is 13620931. The reversal of 13620891 is 19802631.

It is not a de Polignac number, because 13620891 - 2¹ = 13620889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13622891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5206 + ... + 7371.

It is an arithmetic number, because the mean of its divisors is an integer number (1597406).

Almost surely, 2^13620891 is an apocalyptic number.

13620891 is a deficient number, since it is larger than the sum of its proper divisors (5547981).

13620891 is a wasteful number, since it uses less digits than its factorization.

13620891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12618 (or 12599 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 13620891 is about 3690.6491298957. The cubic root of 13620891 is about 238.8187967270.

The spelling of 13620891 in words is "thirteen million, six hundred twenty thousand, eight hundred ninety-one".