15983381 has 4 divisors (see below), whose sum is σ = 15991392. Its totient is φ = 15975372.

The previous prime is 15983377. The next prime is 15983411. The reversal of 15983381 is 18338951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 15983381 - 2² = 15983377 is a prime.

It is a super-2 number, since 2×15983381² = 510936936382322, 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 (15983881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1646 + ... + 5888.

It is an arithmetic number, because the mean of its divisors is an integer number (3997848).

Almost surely, 2^15983381 is an apocalyptic number.

It is an amenable number.

15983381 is a deficient number, since it is larger than the sum of its proper divisors (8011).

15983381 is an equidigital number, since it uses as much as digits as its factorization.

15983381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8010.

The product of its digits is 25920, while the sum is 38.

The square root of 15983381 is about 3997.9220852838. The cubic root of 15983381 is about 251.8969354720.

The spelling of 15983381 in words is "fifteen million, nine hundred eighty-three thousand, three hundred eighty-one".