40013668 has 6 divisors (see below), whose sum is σ = 70023926. Its totient is φ = 20006832.

The previous prime is 40013657. The next prime is 40013669. The reversal of 40013668 is 86631004.

It can be written as a sum of positive squares in only one way, i.e., 39337984 + 675684 = 6272^2 + 822^2 .

It is not an unprimeable number, because it can be changed into a prime (40013669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001705 + ... + 5001712.

Almost surely, 2^40013668 is an apocalyptic number.

It is an amenable number.

40013668 is a deficient number, since it is larger than the sum of its proper divisors (30010258).

40013668 is a wasteful number, since it uses less digits than its factorization.

40013668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10003421 (or 10003419 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 40013668 is about 6325.6357783230. The cubic root of 40013668 is about 342.0341381515.

The spelling of 40013668 in words is "forty million, thirteen thousand, six hundred sixty-eight".