40038909 has 16 divisors (see below), whose sum is σ = 56647680. Its totient is φ = 25084080.

The previous prime is 40038907. The next prime is 40038917. The reversal of 40038909 is 90983004.

It is not a de Polignac number, because 40038909 - 2¹ = 40038907 is a prime.

It is a super-2 number, since 2×40038909² = 3206228467820562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40038909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40038907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4474 + ... + 10004.

It is an arithmetic number, because the mean of its divisors is an integer number (3540480).

Almost surely, 2^40038909 is an apocalyptic number.

It is an amenable number.

40038909 is a deficient number, since it is larger than the sum of its proper divisors (16608771).

40038909 is a wasteful number, since it uses less digits than its factorization.

40038909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 40038909 is about 6327.6305992054. The cubic root of 40038909 is about 342.1060424901.

The spelling of 40038909 in words is "forty million, thirty-eight thousand, nine hundred nine".