40668140 has 48 divisors (see below), whose sum is σ = 89752320. Its totient is φ = 15449280.

The previous prime is 40668109. The next prime is 40668167. The reversal of 40668140 is 4186604.

It is a super-2 number, since 2×40668140² = 3307795222119200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96851 + ... + 97269.

It is an arithmetic number, because the mean of its divisors is an integer number (1869840).

Almost surely, 2^40668140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40668140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44876160).

40668140 is an abundant number, since it is smaller than the sum of its proper divisors (49084180).

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

40668140 is a wasteful number, since it uses less digits than its factorization.

40668140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 40668140 is about 6377.1576740739. The cubic root of 40668140 is about 343.8888567392. Note that the first 4 decimals are identical.

The spelling of 40668140 in words is "forty million, six hundred sixty-eight thousand, one hundred forty".