40091508 has 72 divisors (see below), whose sum is σ = 108468360. Its totient is φ = 12441600.

The previous prime is 40091497. The next prime is 40091521. The reversal of 40091508 is 80519004.

It can be written as a sum of positive squares in 4 ways, for example, as 21790224 + 18301284 = 4668^2 + 4278^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66408 + ... + 67008.

It is an arithmetic number, because the mean of its divisors is an integer number (1506505).

Almost surely, 2^40091508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40091508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54234180).

40091508 is an abundant number, since it is smaller than the sum of its proper divisors (68376852).

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

40091508 is a wasteful number, since it uses less digits than its factorization.

40091508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 40091508 is about 6331.7855301645. The cubic root of 40091508 is about 342.2557848463.

Adding to 40091508 its sum of digits (27), we get a triangular number (40091535 = T₈₉₅₄).

The spelling of 40091508 in words is "forty million, ninety-one thousand, five hundred eight".