40491864 has 48 divisors (see below), whose sum is σ = 125333520. Its totient is φ = 11568960.

The previous prime is 40491833. The next prime is 40491881. The reversal of 40491864 is 46819404.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39667 + ... + 40674.

It is an arithmetic number, because the mean of its divisors is an integer number (2611115).

Almost surely, 2^40491864 is an apocalyptic number.

It is an amenable number.

40491864 is an abundant number, since it is smaller than the sum of its proper divisors (84841656).

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

40491864 is a wasteful number, since it uses less digits than its factorization.

40491864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80360 (or 80353 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 40491864 is about 6363.3217740422. The cubic root of 40491864 is about 343.3912751887.

The spelling of 40491864 in words is "forty million, four hundred ninety-one thousand, eight hundred sixty-four".