15997880 has 32 divisors (see below), whose sum is σ = 37562400. Its totient is φ = 6120576.

The previous prime is 15997873. The next prime is 15997889. The reversal of 15997880 is 8879951.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997889) 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 7 ways as a sum of consecutive naturals, for example, 7775 + ... + 9614.

It is an arithmetic number, because the mean of its divisors is an integer number (1173825).

Almost surely, 2^15997880 is an apocalyptic number.

15997880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15997880 is an abundant number, since it is smaller than the sum of its proper divisors (21564520).

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

15997880 is a wasteful number, since it uses less digits than its factorization.

15997880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17423 (or 17419 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 15997880 is about 3999.7349912213. The cubic root of 15997880 is about 251.9730801848.

The spelling of 15997880 in words is "fifteen million, nine hundred ninety-seven thousand, eight hundred eighty".