91400440 has 32 divisors (see below), whose sum is σ = 209142000. Its totient is φ = 35939584.

The previous prime is 91400417. The next prime is 91400447. The reversal of 91400440 is 4400419.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91400447) 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, 17005 + ... + 21724.

Almost surely, 2^91400440 is an apocalyptic number.

It is an amenable number.

91400440 is an abundant number, since it is smaller than the sum of its proper divisors (117741560).

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

91400440 is a wasteful number, since it uses less digits than its factorization.

91400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38799 (or 38795 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 91400440 is about 9560.3577338926. The cubic root of 91400440 is about 450.4529431185.

Adding to 91400440 its reverse (4400419), we get a palindrome (95800859).

The spelling of 91400440 in words is "ninety-one million, four hundred thousand, four hundred forty".