40991478 has 16 divisors (see below), whose sum is σ = 89436096. Its totient is φ = 12421640.

The previous prime is 40991477. The next prime is 40991501. The reversal of 40991478 is 87419904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40991477) 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, 310476 + ... + 310607.

It is an arithmetic number, because the mean of its divisors is an integer number (5589756).

Almost surely, 2^40991478 is an apocalyptic number.

40991478 is an abundant number, since it is smaller than the sum of its proper divisors (48444618).

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

40991478 is a wasteful number, since it uses less digits than its factorization.

40991478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621099.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 40991478 is about 6402.4587464505. The cubic root of 40991478 is about 344.7978315639.

The spelling of 40991478 in words is "forty million, nine hundred ninety-one thousand, four hundred seventy-eight".