40642518 has 32 divisors (see below), whose sum is σ = 96938496. Its totient is φ = 11107008.

The previous prime is 40642517. The next prime is 40642549. The reversal of 40642518 is 81524604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40642517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20071 + ... + 22002.

It is an arithmetic number, because the mean of its divisors is an integer number (3029328).

Almost surely, 2^40642518 is an apocalyptic number.

40642518 is an abundant number, since it is smaller than the sum of its proper divisors (56295978).

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

40642518 is a wasteful number, since it uses less digits than its factorization.

40642518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42108.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 40642518 is about 6375.1484688594. The cubic root of 40642518 is about 343.8166218861.

It can be divided in two parts, 406 and 42518, that added together give a palindrome (42924).

The spelling of 40642518 in words is "forty million, six hundred forty-two thousand, five hundred eighteen".