91380042 has 32 divisors (see below), whose sum is σ = 218688960. Its totient is φ = 28116720.

The previous prime is 91380019. The next prime is 91380059. The reversal of 91380042 is 24008319.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 91379988 and 91380015.

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 15 ways as a sum of consecutive naturals, for example, 64384 + ... + 65787.

It is an arithmetic number, because the mean of its divisors is an integer number (6834030).

Almost surely, 2^91380042 is an apocalyptic number.

91380042 is an abundant number, since it is smaller than the sum of its proper divisors (127308918).

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

91380042 is a wasteful number, since it uses less digits than its factorization.

91380042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130195 (or 130189 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 91380042 is about 9559.2908732813. The cubic root of 91380042 is about 450.4194311619.

The spelling of 91380042 in words is "ninety-one million, three hundred eighty thousand, forty-two".