40668390 has 48 divisors (see below), whose sum is σ = 120845088. Its totient is φ = 9295488.

The previous prime is 40668367. The next prime is 40668391. The reversal of 40668390 is 9386604.

40668390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40668391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31647 + ... + 32906.

It is an arithmetic number, because the mean of its divisors is an integer number (2517606).

Almost surely, 2^40668390 is an apocalyptic number.

40668390 is an abundant number, since it is smaller than the sum of its proper divisors (80176698).

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

40668390 is a wasteful number, since it uses less digits than its factorization.

40668390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64573 (or 64570 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 40668390 is about 6377.1772752527. The cubic root of 40668390 is about 343.8895614025.

The spelling of 40668390 in words is "forty million, six hundred sixty-eight thousand, three hundred ninety".