40665872 has 40 divisors (see below), whose sum is σ = 85374744. Its totient is φ = 18653184.

The previous prime is 40665869. The next prime is 40665883. The reversal of 40665872 is 27856604.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3748096 + 36917776 = 1936^2 + 6076^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39638 + ... + 40650.

Almost surely, 2^40665872 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 40665872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42687372).

40665872 is an abundant number, since it is smaller than the sum of its proper divisors (44708872).

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

40665872 is a wasteful number, since it uses less digits than its factorization.

40665872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227 (or 1221 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 40665872 is about 6376.9798494272. The cubic root of 40665872 is about 343.8824639017.

The spelling of 40665872 in words is "forty million, six hundred sixty-five thousand, eight hundred seventy-two".