40137640 has 32 divisors (see below), whose sum is σ = 90972000. Its totient is φ = 15937344.

The previous prime is 40137613. The next prime is 40137667. The reversal of 40137640 is 4673104.

It is an interprime number because it is at equal distance from previous prime (40137613) and next prime (40137667).

It is a super-2 number, since 2×40137640² = 3222060289539200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1951 + ... + 9169.

It is an arithmetic number, because the mean of its divisors is an integer number (2842875).

Almost surely, 2^40137640 is an apocalyptic number.

40137640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40137640 is an abundant number, since it is smaller than the sum of its proper divisors (50834360).

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

40137640 is a wasteful number, since it uses less digits than its factorization.

40137640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7369 (or 7365 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 40137640 is about 6335.4273731138. The cubic root of 40137640 is about 342.3870087437.

The spelling of 40137640 in words is "forty million, one hundred thirty-seven thousand, six hundred forty".