91974398 has 16 divisors (see below), whose sum is σ = 143999856. Its totient is φ = 44016960.

The previous prime is 91974371. The next prime is 91974409. The reversal of 91974398 is 89347919.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6236 + ... + 14927.

It is an arithmetic number, because the mean of its divisors is an integer number (8999991).

Almost surely, 2^91974398 is an apocalyptic number.

91974398 is a deficient number, since it is larger than the sum of its proper divisors (52025458).

91974398 is a wasteful number, since it uses less digits than its factorization.

91974398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21259.

The product of its digits is 489888, while the sum is 50.

The square root of 91974398 is about 9590.3283572566. The cubic root of 91974398 is about 451.3938640903.

The spelling of 91974398 in words is "ninety-one million, nine hundred seventy-four thousand, three hundred ninety-eight".