15003981 has 32 divisors (see below), whose sum is σ = 23857920. Its totient is φ = 9294912.

The previous prime is 15003973. The next prime is 15004001. The reversal of 15003981 is 18930051.

It is not a de Polignac number, because 15003981 - 2³ = 15003973 is a prime.

It is a super-2 number, since 2×15003981² = 450238891696722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15003931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22651 + ... + 23303.

It is an arithmetic number, because the mean of its divisors is an integer number (745560).

Almost surely, 2^15003981 is an apocalyptic number.

It is an amenable number.

15003981 is a deficient number, since it is larger than the sum of its proper divisors (8853939).

15003981 is a wasteful number, since it uses less digits than its factorization.

15003981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 15003981 is about 3873.4972570017. The cubic root of 15003981 is about 246.6430232593.

The spelling of 15003981 in words is "fifteen million, three thousand, nine hundred eighty-one".