40491288 has 48 divisors (see below), whose sum is σ = 109956600. Its totient is φ = 13461120.

The previous prime is 40491281. The next prime is 40491289. The reversal of 40491288 is 88219404.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40491281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52828 + ... + 53588.

Almost surely, 2^40491288 is an apocalyptic number.

It is an amenable number.

40491288 is an abundant number, since it is smaller than the sum of its proper divisors (69465312).

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

40491288 is a wasteful number, since it uses less digits than its factorization.

40491288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512 (or 1505 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 40491288 is about 6363.2765145010. The cubic root of 40491288 is about 343.3896469249.

The spelling of 40491288 in words is "forty million, four hundred ninety-one thousand, two hundred eighty-eight".