91921404 has 24 divisors (see below), whose sum is σ = 214690000. Its totient is φ = 30610944.

The previous prime is 91921367. The next prime is 91921433. The reversal of 91921404 is 40412919.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11922 + ... + 18054.

Almost surely, 2^91921404 is an apocalyptic number.

It is an amenable number.

91921404 is an abundant number, since it is smaller than the sum of its proper divisors (122768596).

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

91921404 is a wasteful number, since it uses less digits than its factorization.

91921404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7389 (or 7387 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 91921404 is about 9587.5650714871. The cubic root of 91921404 is about 451.3071524156.

The spelling of 91921404 in words is "ninety-one million, nine hundred twenty-one thousand, four hundred four".