15940816 has 10 divisors (see below), whose sum is σ = 30885362. Its totient is φ = 7970400.

The previous prime is 15940811. The next prime is 15940819. The reversal of 15940816 is 61804951.

It can be written as a sum of positive squares in only one way, i.e., 8433216 + 7507600 = 2904^2 + 2740^2 .

It is a super-2 number, since 2×15940816² = 508219229491712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15940811) 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 as a sum of consecutive naturals, namely, 498135 + ... + 498166.

Almost surely, 2^15940816 is an apocalyptic number.

15940816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15940816 is a deficient number, since it is larger than the sum of its proper divisors (14944546).

15940816 is an equidigital number, since it uses as much as digits as its factorization.

15940816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996309 (or 996303 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 15940816 is about 3992.5951460172. The cubic root of 15940816 is about 251.6731295701.

The spelling of 15940816 in words is "fifteen million, nine hundred forty thousand, eight hundred sixteen".