13620009 has 16 divisors (see below), whose sum is σ = 20708352. Its totient is φ = 7888128.

The previous prime is 13620007. The next prime is 13620011. The reversal of 13620009 is 90002631.

It is an interprime number because it is at equal distance from previous prime (13620007) and next prime (13620011).

It is not a de Polignac number, because 13620009 - 2¹ = 13620007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13620007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9609 + ... + 10934.

It is an arithmetic number, because the mean of its divisors is an integer number (1294272).

Almost surely, 2^13620009 is an apocalyptic number.

It is an amenable number.

13620009 is a deficient number, since it is larger than the sum of its proper divisors (7088343).

13620009 is a wasteful number, since it uses less digits than its factorization.

13620009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20576.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 13620009 is about 3690.5296367866. The cubic root of 13620009 is about 238.8136418335.

The spelling of 13620009 in words is "thirteen million, six hundred twenty thousand, nine".