40669921 has 4 divisors (see below), whose sum is σ = 41437332. Its totient is φ = 39902512.

The previous prime is 40669907. The next prime is 40669961. The reversal of 40669921 is 12996604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36000000 + 4669921 = 6000^2 + 2161^2 .

It is a cyclic number.

It is not a de Polignac number, because 40669921 - 2⁷ = 40669793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40669901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383626 + ... + 383731.

It is an arithmetic number, because the mean of its divisors is an integer number (10359333).

Almost surely, 2^40669921 is an apocalyptic number.

It is an amenable number.

40669921 is a deficient number, since it is larger than the sum of its proper divisors (767411).

40669921 is an equidigital number, since it uses as much as digits as its factorization.

40669921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767410.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 40669921 is about 6377.2973115576. The cubic root of 40669921 is about 343.8938766976.

The spelling of 40669921 in words is "forty million, six hundred sixty-nine thousand, nine hundred twenty-one".