91189440 has 84 divisors (see below), whose sum is σ = 313663584. Its totient is φ = 24316416.

The previous prime is 91189433. The next prime is 91189451. The reversal of 91189440 is 4498119.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 91189395 and 91189404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12952 + ... + 18711.

Almost surely, 2^91189440 is an apocalyptic number.

91189440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91189440 is an abundant number, since it is smaller than the sum of its proper divisors (222474144).

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

91189440 is a wasteful number, since it uses less digits than its factorization.

91189440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31686 (or 31673 counting only the distinct ones).

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

The square root of 91189440 is about 9549.3162058862. The cubic root of 91189440 is about 450.1060490801.

The spelling of 91189440 in words is "ninety-one million, one hundred eighty-nine thousand, four hundred forty".