39397021 has 2 divisors, whose sum is σ = 39397022. Its totient is φ = 39397020.

The previous prime is 39397009. The next prime is 39397087. The reversal of 39397021 is 12079393.

39397021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38613796 + 783225 = 6214^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 39397021 - 2⁵ = 39396989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39397121) 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, 19698510 + 19698511.

It is an arithmetic number, because the mean of its divisors is an integer number (19698511).

Almost surely, 2^39397021 is an apocalyptic number.

It is an amenable number.

39397021 is a deficient number, since it is larger than the sum of its proper divisors (1).

39397021 is an equidigital number, since it uses as much as digits as its factorization.

39397021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 39397021 is about 6276.7046290231. The cubic root of 39397021 is about 340.2680153169.

The spelling of 39397021 in words is "thirty-nine million, three hundred ninety-seven thousand, twenty-one".