13620639 has 8 divisors (see below), whose sum is σ = 18178992. Its totient is φ = 9071360.

The previous prime is 13620619. The next prime is 13620641. The reversal of 13620639 is 93602631.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13620639 - 2⁹ = 13620127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13620619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2959 + ... + 5999.

It is an arithmetic number, because the mean of its divisors is an integer number (2272374).

Almost surely, 2^13620639 is an apocalyptic number.

13620639 is a deficient number, since it is larger than the sum of its proper divisors (4558353).

13620639 is a wasteful number, since it uses less digits than its factorization.

13620639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 13620639 is about 3690.6149894022. The cubic root of 13620639 is about 238.8173239230.

The spelling of 13620639 in words is "thirteen million, six hundred twenty thousand, six hundred thirty-nine".