15997956 has 24 divisors (see below), whose sum is σ = 40200384. Its totient is φ = 4922400.

The previous prime is 15997889. The next prime is 15997957. The reversal of 15997956 is 65979951.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 15997899 and 15997908.

It is not an unprimeable number, because it can be changed into a prime (15997957) 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, 51120 + ... + 51431.

It is an arithmetic number, because the mean of its divisors is an integer number (1675016).

Almost surely, 2^15997956 is an apocalyptic number.

It is an amenable number.

15997956 is an abundant number, since it is smaller than the sum of its proper divisors (24202428).

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

15997956 is a wasteful number, since it uses less digits than its factorization.

15997956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102571 (or 102569 counting only the distinct ones).

The product of its digits is 765450, while the sum is 51.

The square root of 15997956 is about 3999.7444918394. The cubic root of 15997956 is about 251.9734791944.

The spelling of 15997956 in words is "fifteen million, nine hundred ninety-seven thousand, nine hundred fifty-six".