39307421 has 2 divisors, whose sum is σ = 39307422. Its totient is φ = 39307420.

The previous prime is 39307381. The next prime is 39307427. The reversal of 39307421 is 12470393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30096196 + 9211225 = 5486^2 + 3035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39307421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39307427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19653710 + 19653711.

It is an arithmetic number, because the mean of its divisors is an integer number (19653711).

Almost surely, 2^39307421 is an apocalyptic number.

It is an amenable number.

39307421 is a deficient number, since it is larger than the sum of its proper divisors (1).

39307421 is an equidigital number, since it uses as much as digits as its factorization.

39307421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 39307421 is about 6269.5630629255. The cubic root of 39307421 is about 340.0098641890.

The spelling of 39307421 in words is "thirty-nine million, three hundred seven thousand, four hundred twenty-one".