918404 has 6 divisors (see below), whose sum is σ = 1607214. Its totient is φ = 459200.

The previous prime is 918397. The next prime is 918431. The reversal of 918404 is 404819.

It can be written as a sum of positive squares in only one way, i.e., 906304 + 12100 = 952^2 + 110^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918404.

It is an unprimeable number.

918404 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 (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114797 + ... + 114804.

It is an arithmetic number, because the mean of its divisors is an integer number (267869).

2⁹¹⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

918404 is a deficient number, since it is larger than the sum of its proper divisors (688810).

918404 is a wasteful number, since it uses less digits than its factorization.

918404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229605 (or 229603 counting only the distinct ones).

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

The square root of 918404 is about 958.3339710143. Note that the first 3 decimals coincide. The cubic root of 918404 is about 97.2026090625.

The spelling of 918404 in words is "nine hundred eighteen thousand, four hundred four".