40137618 has 16 divisors (see below), whose sum is σ = 80382240. Its totient is φ = 13361376.

The previous prime is 40137613. The next prime is 40137667. The reversal of 40137618 is 81673104.

It is a happy number.

It is a super-2 number, since 2×40137618² = 3222056757427848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40137611) 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, 918 + ... + 9006.

It is an arithmetic number, because the mean of its divisors is an integer number (5023890).

Almost surely, 2^40137618 is an apocalyptic number.

40137618 is an abundant number, since it is smaller than the sum of its proper divisors (40244622).

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

40137618 is a wasteful number, since it uses less digits than its factorization.

40137618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8921.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 40137618 is about 6335.4256368456. The cubic root of 40137618 is about 342.3869461880.

It can be divided in two parts, 40137 and 618, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 40137618 in words is "forty million, one hundred thirty-seven thousand, six hundred eighteen".