15998976 has 168 divisors, whose sum is σ = 54522624. Its totient is φ = 4423680.

The previous prime is 15998963. The next prime is 15998977. The reversal of 15998976 is 67989951.

It is a tau number, because it is divible by the number of its divisors (168).

Its product of digits (1224720) is a multiple of the sum of its prime factors (70).

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15998977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 516081 + ... + 516111.

Almost surely, 2^15998976 is an apocalyptic number.

15998976 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15998976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27261312).

15998976 is an abundant number, since it is smaller than the sum of its proper divisors (38523648).

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

15998976 is an equidigital number, since it uses as much as digits as its factorization.

15998976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 43 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 15998976 is about 3999.8719979519. The cubic root of 15998976 is about 251.9788342011.

It can be divided in two parts, 15 and 998976, that added together give a triangular number (998991 = T₁₄₁₃).

The spelling of 15998976 in words is "fifteen million, nine hundred ninety-eight thousand, nine hundred seventy-six".