917138860 has 96 divisors (see below), whose sum is σ = 2142733824. Its totient is φ = 329700800.

The previous prime is 917138857. The next prime is 917138863. The reversal of 917138860 is 68831719.

It is an interprime number because it is at equal distance from previous prime (917138857) and next prime (917138863).

It is a super-2 number, since 2×917138860² = 1682287377044199200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (917138863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3487089 + ... + 3487351.

It is an arithmetic number, because the mean of its divisors is an integer number (22320144).

Almost surely, 2^917138860 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 917138860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071366912).

917138860 is an abundant number, since it is smaller than the sum of its proper divisors (1225594964).

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

917138860 is a wasteful number, since it uses less digits than its factorization.

917138860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 917138860 is about 30284.3005532570. The cubic root of 917138860 is about 971.5795499603.

The spelling of 917138860 in words is "nine hundred seventeen million, one hundred thirty-eight thousand, eight hundred sixty".