39231397 has 2 divisors, whose sum is σ = 39231398. Its totient is φ = 39231396.

The previous prime is 39231377. The next prime is 39231407. The reversal of 39231397 is 79313293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22982436 + 16248961 = 4794^2 + 4031^2 .

It is an emirp because it is prime and its reverse (79313293) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39231397 - 2²³ = 30842789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39231347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19615698 + 19615699.

It is an arithmetic number, because the mean of its divisors is an integer number (19615699).

Almost surely, 2^39231397 is an apocalyptic number.

It is an amenable number.

39231397 is a deficient number, since it is larger than the sum of its proper divisors (1).

39231397 is an equidigital number, since it uses as much as digits as its factorization.

39231397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 37.

The square root of 39231397 is about 6263.4971860774. The cubic root of 39231397 is about 339.7905197508.

The spelling of 39231397 in words is "thirty-nine million, two hundred thirty-one thousand, three hundred ninety-seven".