40923721 has 4 divisors (see below), whose sum is σ = 40953600. Its totient is φ = 40893844.

The previous prime is 40923691. The next prime is 40923733. The reversal of 40923721 is 12732904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40923721 - 2⁷ = 40923593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40923721.

It is not an unprimeable number, because it can be changed into a prime (40923121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12781 + ... + 15658.

It is an arithmetic number, because the mean of its divisors is an integer number (10238400).

Almost surely, 2^40923721 is an apocalyptic number.

It is an amenable number.

40923721 is a deficient number, since it is larger than the sum of its proper divisors (29879).

40923721 is a wasteful number, since it uses less digits than its factorization.

40923721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29878.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 40923721 is about 6397.1650752501. The cubic root of 40923721 is about 344.6077485515.

The spelling of 40923721 in words is "forty million, nine hundred twenty-three thousand, seven hundred twenty-one".