15864961 has 8 divisors (see below), whose sum is σ = 19198080. Its totient is φ = 12798528.

The previous prime is 15864931. The next prime is 15864973. The reversal of 15864961 is 16946851.

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 15864961 - 2⁵ = 15864929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15864911) 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, 66541 + ... + 66778.

It is an arithmetic number, because the mean of its divisors is an integer number (2399760).

Almost surely, 2^15864961 is an apocalyptic number.

It is an amenable number.

15864961 is a deficient number, since it is larger than the sum of its proper divisors (3333119).

15864961 is a wasteful number, since it uses less digits than its factorization.

15864961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133343.

The product of its digits is 51840, while the sum is 40.

The square root of 15864961 is about 3983.0843576304. The cubic root of 15864961 is about 251.2732958606.

The spelling of 15864961 in words is "fifteen million, eight hundred sixty-four thousand, nine hundred sixty-one".