15327981 has 16 divisors (see below), whose sum is σ = 23441920. Its totient is φ = 9888480.

The previous prime is 15327911. The next prime is 15327989. The reversal of 15327981 is 18972351.

It is not a de Polignac number, because 15327981 - 2⁷ = 15327853 is a prime.

It is a super-2 number, since 2×15327981² = 469894003072722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15327989) 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, 8320 + ... + 9993.

It is an arithmetic number, because the mean of its divisors is an integer number (1465120).

Almost surely, 2^15327981 is an apocalyptic number.

It is an amenable number.

15327981 is a deficient number, since it is larger than the sum of its proper divisors (8113939).

15327981 is a wasteful number, since it uses less digits than its factorization.

15327981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18353 (or 18347 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 15327981 is about 3915.0965505336. The cubic root of 15327981 is about 248.4057537933.

The spelling of 15327981 in words is "fifteen million, three hundred twenty-seven thousand, nine hundred eighty-one".