917940 has 24 divisors (see below), whose sum is σ = 2570400. Its totient is φ = 244768.

The previous prime is 917927. The next prime is 917951. The reversal of 917940 is 49719.

It is a super-2 number, since 2×917940² = 1685227687200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 917898 and 917907.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 917940.

It is an unprimeable number.

917940 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7590 + ... + 7709.

It is an arithmetic number, because the mean of its divisors is an integer number (107100).

2⁹¹⁷⁹⁴⁰ is an apocalyptic number.

It is an amenable number.

917940 is an abundant number, since it is smaller than the sum of its proper divisors (1652460).

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

917940 is a wasteful number, since it uses less digits than its factorization.

917940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15311 (or 15309 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 917940 is about 958.0918536341. The cubic root of 917940 is about 97.1862365989.

The spelling of 917940 in words is "nine hundred seventeen thousand, nine hundred forty".