39944021 has 8 divisors (see below), whose sum is σ = 43244544. Its totient is φ = 36676080.

The previous prime is 39944017. The next prime is 39944039. The reversal of 39944021 is 12044993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39944021 - 2² = 39944017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39944041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5561 + ... + 10526.

It is an arithmetic number, because the mean of its divisors is an integer number (5405568).

Almost surely, 2^39944021 is an apocalyptic number.

It is an amenable number.

39944021 is a deficient number, since it is larger than the sum of its proper divisors (3300523).

39944021 is a wasteful number, since it uses less digits than its factorization.

39944021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16291.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 39944021 is about 6320.1282423698. The cubic root of 39944021 is about 341.8355769485.

The spelling of 39944021 in words is "thirty-nine million, nine hundred forty-four thousand, twenty-one".