40507218 has 12 divisors (see below), whose sum is σ = 87765678. Its totient is φ = 13502400.

The previous prime is 40507157. The next prime is 40507219. The reversal of 40507218 is 81270504.

It can be written as a sum of positive squares in only one way, i.e., 23590449 + 16916769 = 4857^2 + 4113^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40507191 and 40507200.

It is not an unprimeable number, because it can be changed into a prime (40507219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1125183 + ... + 1125218.

Almost surely, 2^40507218 is an apocalyptic number.

40507218 is an abundant number, since it is smaller than the sum of its proper divisors (47258460).

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

40507218 is a wasteful number, since it uses less digits than its factorization.

40507218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250409 (or 2250406 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 40507218 is about 6364.5281050523. The cubic root of 40507218 is about 343.4346729057.

The spelling of 40507218 in words is "forty million, five hundred seven thousand, two hundred eighteen".