15564401 has 8 divisors (see below), whose sum is σ = 17347680. Its totient is φ = 13877568.

The previous prime is 15564389. The next prime is 15564413. The reversal of 15564401 is 10446551.

It is an interprime number because it is at equal distance from previous prime (15564389) and next prime (15564413).

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 15564401 - 2⁶ = 15564337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15564421) 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, 23771 + ... + 24416.

It is an arithmetic number, because the mean of its divisors is an integer number (2168460).

Almost surely, 2^15564401 is an apocalyptic number.

It is an amenable number.

15564401 is a deficient number, since it is larger than the sum of its proper divisors (1783279).

15564401 is a wasteful number, since it uses less digits than its factorization.

15564401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48223.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 15564401 is about 3945.1743941175. The cubic root of 15564401 is about 249.6763866116.

The spelling of 15564401 in words is "fifteen million, five hundred sixty-four thousand, four hundred one".