917991948 has 24 divisors (see below), whose sum is σ = 2162002752. Its totient is φ = 303137104.

The previous prime is 917991937. The next prime is 917991961. The reversal of 917991948 is 849199719.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356190 + ... + 358757.

It is an arithmetic number, because the mean of its divisors is an integer number (90083448).

Almost surely, 2^917991948 is an apocalyptic number.

It is an amenable number.

917991948 is an abundant number, since it is smaller than the sum of its proper divisors (1244010804).

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

917991948 is a wasteful number, since it uses less digits than its factorization.

917991948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715061 (or 715059 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 57.

The square root of 917991948 is about 30298.3819369946. The cubic root of 917991948 is about 971.8806988331.

The spelling of 917991948 in words is "nine hundred seventeen million, nine hundred ninety-one thousand, nine hundred forty-eight".