91442040 has 32 divisors (see below), whose sum is σ = 274326480. Its totient is φ = 24384512.

The previous prime is 91442023. The next prime is 91442047. The reversal of 91442040 is 4024419.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 91442040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91442047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380889 + ... + 381128.

Almost surely, 2^91442040 is an apocalyptic number.

It is an amenable number.

91442040 is an abundant number, since it is smaller than the sum of its proper divisors (182884440).

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

91442040 is a wasteful number, since it uses less digits than its factorization.

91442040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762031 (or 762027 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 91442040 is about 9562.5331371975. The cubic root of 91442040 is about 450.5212724767.

Adding to 91442040 its reverse (4024419), we get a palindrome (95466459).

The spelling of 91442040 in words is "ninety-one million, four hundred forty-two thousand, forty".