15961944 has 32 divisors (see below), whose sum is σ = 40835520. Its totient is φ = 5196576.

The previous prime is 15961943. The next prime is 15961951. The reversal of 15961944 is 44916951.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15961943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6702 + ... + 8765.

It is an arithmetic number, because the mean of its divisors is an integer number (1276110).

Almost surely, 2^15961944 is an apocalyptic number.

It is an amenable number.

15961944 is an abundant number, since it is smaller than the sum of its proper divisors (24873576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15961944 is a wasteful number, since it uses less digits than its factorization.

15961944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15519 (or 15515 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 15961944 is about 3995.2401679999. The cubic root of 15961944 is about 251.7842698948.

The spelling of 15961944 in words is "fifteen million, nine hundred sixty-one thousand, nine hundred forty-four".