40818390 has 16 divisors (see below), whose sum is σ = 97964208. Its totient is φ = 10884896.

The previous prime is 40818359. The next prime is 40818391. The reversal of 40818390 is 9381804.

It is a super-2 number, since 2×40818390² = 3332281924384200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40818391) 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, 680277 + ... + 680336.

It is an arithmetic number, because the mean of its divisors is an integer number (6122763).

Almost surely, 2^40818390 is an apocalyptic number.

40818390 is an abundant number, since it is smaller than the sum of its proper divisors (57145818).

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

40818390 is a wasteful number, since it uses less digits than its factorization.

40818390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360623.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 40818390 is about 6388.9271399821. The cubic root of 40818390 is about 344.3118397721.

The spelling of 40818390 in words is "forty million, eight hundred eighteen thousand, three hundred ninety".