39399793 has 2 divisors, whose sum is σ = 39399794. Its totient is φ = 39399792.

The previous prime is 39399781. The next prime is 39399799. The reversal of 39399793 is 39799393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35605089 + 3794704 = 5967^2 + 1948^2 .

It is an emirp because it is prime and its reverse (39799393) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39399793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39399793.

It is not a weakly prime, because it can be changed into another prime (39399799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19699896 + 19699897.

It is an arithmetic number, because the mean of its divisors is an integer number (19699897).

Almost surely, 2^39399793 is an apocalyptic number.

It is an amenable number.

39399793 is a deficient number, since it is larger than the sum of its proper divisors (1).

39399793 is an equidigital number, since it uses as much as digits as its factorization.

39399793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1240029, while the sum is 52.

The square root of 39399793 is about 6276.9254416474. The cubic root of 39399793 is about 340.2759956226.

The spelling of 39399793 in words is "thirty-nine million, three hundred ninety-nine thousand, seven hundred ninety-three".