915980 has 36 divisors (see below), whose sum is σ = 2090592. Its totient is φ = 336960.

The previous prime is 915973. The next prime is 915991. The reversal of 915980 is 89519.

It is an unprimeable number.

915980 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3245 + ... + 3515.

It is an arithmetic number, because the mean of its divisors is an integer number (58072).

2⁹¹⁵⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 915980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045296).

915980 is an abundant number, since it is smaller than the sum of its proper divisors (1174612).

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

915980 is a wasteful number, since it uses less digits than its factorization.

915980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 915980 is about 957.0684406039. The cubic root of 915980 is about 97.1170161123.

The spelling of 915980 in words is "nine hundred fifteen thousand, nine hundred eighty".