918440 has 16 divisors (see below), whose sum is σ = 2066580. Its totient is φ = 367360.

The previous prime is 918439. The next prime is 918443. The reversal of 918440 is 44819.

It can be written as a sum of positive squares in 2 ways, for example, as 917764 + 676 = 958^2 + 26^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918440.

It is not an unprimeable number, because it can be changed into a prime (918443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11441 + ... + 11520.

2⁹¹⁸⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

918440 is an abundant number, since it is smaller than the sum of its proper divisors (1148140).

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

918440 is a wasteful number, since it uses less digits than its factorization.

918440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22972 (or 22968 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 918440 is about 958.3527534264. The cubic root of 918440 is about 97.2038791093.

The spelling of 918440 in words is "nine hundred eighteen thousand, four hundred forty".