15997967 has 4 divisors (see below), whose sum is σ = 16007976. Its totient is φ = 15987960.

The previous prime is 15997957. The next prime is 15997973. The reversal of 15997967 is 76979951.

15997967 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 76979951 = 151 ⋅509801.

It is a cyclic number.

It is not a de Polignac number, because 15997967 - 2¹⁰ = 15996943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997957) 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, 2009 + ... + 6002.

It is an arithmetic number, because the mean of its divisors is an integer number (4001994).

Almost surely, 2^15997967 is an apocalyptic number.

15997967 is a deficient number, since it is larger than the sum of its proper divisors (10009).

15997967 is an equidigital number, since it uses as much as digits as its factorization.

15997967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10008.

The product of its digits is 1071630, while the sum is 53.

The square root of 15997967 is about 3999.7458669270. The cubic root of 15997967 is about 251.9735369457.

The spelling of 15997967 in words is "fifteen million, nine hundred ninety-seven thousand, nine hundred sixty-seven".