15996397 has 4 divisors (see below), whose sum is σ = 16007680. Its totient is φ = 15985116.

The previous prime is 15996391. The next prime is 15996427. The reversal of 15996397 is 79369951.

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 15996397 - 2³ = 15996389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15996397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15996391) 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, 3147 + ... + 6472.

It is an arithmetic number, because the mean of its divisors is an integer number (4001920).

Almost surely, 2^15996397 is an apocalyptic number.

It is an amenable number.

15996397 is a deficient number, since it is larger than the sum of its proper divisors (11283).

15996397 is an equidigital number, since it uses as much as digits as its factorization.

15996397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11282.

The product of its digits is 459270, while the sum is 49.

The square root of 15996397 is about 3999.5495996424. The cubic root of 15996397 is about 251.9652939943.

The spelling of 15996397 in words is "fifteen million, nine hundred ninety-six thousand, three hundred ninety-seven".