40899921 has 16 divisors (see below), whose sum is σ = 55710720. Its totient is φ = 26682320.

The previous prime is 40899907. The next prime is 40899967. The reversal of 40899921 is 12999804.

It is a cyclic number.

It is not a de Polignac number, because 40899921 - 2⁶ = 40899857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40899821) 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, 54676 + ... + 55418.

It is an arithmetic number, because the mean of its divisors is an integer number (3481920).

Almost surely, 2^40899921 is an apocalyptic number.

It is an amenable number.

40899921 is a deficient number, since it is larger than the sum of its proper divisors (14810799).

40899921 is a wasteful number, since it uses less digits than its factorization.

40899921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 40899921 is about 6395.3046057244. The cubic root of 40899921 is about 344.5409311110.

The spelling of 40899921 in words is "forty million, eight hundred ninety-nine thousand, nine hundred twenty-one".