40867921 has 4 divisors (see below), whose sum is σ = 40891572. Its totient is φ = 40844272.

The previous prime is 40867913. The next prime is 40867927. The reversal of 40867921 is 12976804.

40867921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 14745600 + 26122321 = 3840^2 + 5111^2 .

It is a cyclic number.

It is not a de Polignac number, because 40867921 - 2³ = 40867913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40867927) 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 3 ways as a sum of consecutive naturals, for example, 9010 + ... + 12763.

It is an arithmetic number, because the mean of its divisors is an integer number (10222893).

Almost surely, 2^40867921 is an apocalyptic number.

It is an amenable number.

40867921 is a deficient number, since it is larger than the sum of its proper divisors (23651).

40867921 is a wasteful number, since it uses less digits than its factorization.

40867921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23650.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 40867921 is about 6392.8022806904. The cubic root of 40867921 is about 344.4510516673.

The spelling of 40867921 in words is "forty million, eight hundred sixty-seven thousand, nine hundred twenty-one".