40218930 has 72 divisors (see below), whose sum is σ = 108762732. Its totient is φ = 10707552.

The previous prime is 40218917. The next prime is 40218931. The reversal of 40218930 is 3981204.

It can be written as a sum of positive squares in 2 ways, for example, as 33074001 + 7144929 = 5751^2 + 2673^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 40218894 and 40218903.

It is not an unprimeable number, because it can be changed into a prime (40218931) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65304 + ... + 65916.

Almost surely, 2^40218930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40218930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54381366).

40218930 is an abundant number, since it is smaller than the sum of its proper divisors (68543802).

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

40218930 is an frugal number, since it uses more digits than its factorization.

40218930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 40218930 is about 6341.8396384645. The cubic root of 40218930 is about 342.6179961777.

The spelling of 40218930 in words is "forty million, two hundred eighteen thousand, nine hundred thirty".