15996813 has 16 divisors (see below), whose sum is σ = 25810560. Its totient is φ = 8603136.

The previous prime is 15996811. The next prime is 15996863. The reversal of 15996813 is 31869951.

It is not a de Polignac number, because 15996813 - 2¹ = 15996811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15996811) 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 15 ways as a sum of consecutive naturals, for example, 22048 + ... + 22761.

It is an arithmetic number, because the mean of its divisors is an integer number (1613160).

Almost surely, 2^15996813 is an apocalyptic number.

It is an amenable number.

15996813 is a deficient number, since it is larger than the sum of its proper divisors (9813747).

15996813 is a wasteful number, since it uses less digits than its factorization.

15996813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44836.

The product of its digits is 58320, while the sum is 42.

The square root of 15996813 is about 3999.6016051602. The cubic root of 15996813 is about 251.9674781664.

The spelling of 15996813 in words is "fifteen million, nine hundred ninety-six thousand, eight hundred thirteen".