39953021 has 2 divisors, whose sum is σ = 39953022. Its totient is φ = 39953020.

The previous prime is 39952967. The next prime is 39953033. The reversal of 39953021 is 12035993.

39953021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33120025 + 6832996 = 5755^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 39953021 - 2¹⁸ = 39690877 is a prime.

It is equal to p_2430968 and since 39953021 and 2430968 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39953041) 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 as a sum of consecutive naturals, namely, 19976510 + 19976511.

It is an arithmetic number, because the mean of its divisors is an integer number (19976511).

Almost surely, 2^39953021 is an apocalyptic number.

It is an amenable number.

39953021 is a deficient number, since it is larger than the sum of its proper divisors (1).

39953021 is an equidigital number, since it uses as much as digits as its factorization.

39953021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 39953021 is about 6320.8402131362. The cubic root of 39953021 is about 341.8612486183.

The spelling of 39953021 in words is "thirty-nine million, nine hundred fifty-three thousand, twenty-one".