39939407 has 2 divisors, whose sum is σ = 39939408. Its totient is φ = 39939406.

The previous prime is 39939397. The next prime is 39939421. The reversal of 39939407 is 70493993.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (70493993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39939407 - 2⁶ = 39939343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39909407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19969703 + 19969704.

It is an arithmetic number, because the mean of its divisors is an integer number (19969704).

Almost surely, 2^39939407 is an apocalyptic number.

39939407 is a deficient number, since it is larger than the sum of its proper divisors (1).

39939407 is an equidigital number, since it uses as much as digits as its factorization.

39939407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 39939407 is about 6319.7632075893. The cubic root of 39939407 is about 341.8224144438.

The spelling of 39939407 in words is "thirty-nine million, nine hundred thirty-nine thousand, four hundred seven".