91918404 has 18 divisors (see below), whose sum is σ = 232349390. Its totient is φ = 30639456.

The previous prime is 91918403. The next prime is 91918451. The reversal of 91918404 is 40481919.

It can be written as a sum of positive squares in only one way, i.e., 82628100 + 9290304 = 9090^2 + 3048^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2553289 = 91918404 / (9 + 1 + 9 + 1 + 8 + 4 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (91918403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1276609 + ... + 1276680.

Almost surely, 2^91918404 is an apocalyptic number.

It is an amenable number.

91918404 is an abundant number, since it is smaller than the sum of its proper divisors (140430986).

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

91918404 is a wasteful number, since it uses less digits than its factorization.

91918404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553299 (or 2553294 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 91918404 is about 9587.4086175567. The cubic root of 91918404 is about 451.3022426553.

The spelling of 91918404 in words is "ninety-one million, nine hundred eighteen thousand, four hundred four".