40513218 has 32 divisors (see below), whose sum is σ = 84295680. Its totient is φ = 12966480.

The previous prime is 40513217. The next prime is 40513219. The reversal of 40513218 is 81231504.

It is an interprime number because it is at equal distance from previous prime (40513217) and next prime (40513219).

It is not an unprimeable number, because it can be changed into a prime (40513217) 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, 25071 + ... + 26637.

It is an arithmetic number, because the mean of its divisors is an integer number (2634240).

Almost surely, 2^40513218 is an apocalyptic number.

40513218 is an abundant number, since it is smaller than the sum of its proper divisors (43782462).

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

40513218 is a wasteful number, since it uses less digits than its factorization.

40513218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 40513218 is about 6364.9994501178. Note that the first 3 decimals coincide. The cubic root of 40513218 is about 343.4516287835.

The spelling of 40513218 in words is "forty million, five hundred thirteen thousand, two hundred eighteen".