15997982 has 64 divisors (see below), whose sum is σ = 32997888. Its totient is φ = 5616000.

The previous prime is 15997979. The next prime is 15997999. The reversal of 15997982 is 28979951.

It is a happy number.

15997982 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 15997982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122057 + ... + 122187.

It is an arithmetic number, because the mean of its divisors is an integer number (515592).

Almost surely, 2^15997982 is an apocalyptic number.

15997982 is an abundant number, since it is smaller than the sum of its proper divisors (16999906).

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

15997982 is a wasteful number, since it uses less digits than its factorization.

15997982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225.

The product of its digits is 408240, while the sum is 50.

The square root of 15997982 is about 3999.7477420457. The cubic root of 15997982 is about 251.9736156974.

It can be divided in two parts, 159979 and 82, that added together give a palindrome (160061).

The spelling of 15997982 in words is "fifteen million, nine hundred ninety-seven thousand, nine hundred eighty-two".