40667021 has 4 divisors (see below), whose sum is σ = 40710912. Its totient is φ = 40623132.

The previous prime is 40666987. The next prime is 40667023. The reversal of 40667021 is 12076604.

40667021 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40667021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40667023) 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, 20525 + ... + 22418.

It is an arithmetic number, because the mean of its divisors is an integer number (10177728).

Almost surely, 2^40667021 is an apocalyptic number.

It is an amenable number.

40667021 is a deficient number, since it is larger than the sum of its proper divisors (43891).

40667021 is an equidigital number, since it uses as much as digits as its factorization.

40667021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43890.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 40667021 is about 6377.0699384592. The cubic root of 40667021 is about 343.8857026308.

The spelling of 40667021 in words is "forty million, six hundred sixty-seven thousand, twenty-one".