39994369 has 2 divisors, whose sum is σ = 39994370. Its totient is φ = 39994368.

The previous prime is 39994307. The next prime is 39994391. The reversal of 39994369 is 96349993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38291344 + 1703025 = 6188^2 + 1305^2 .

It is an emirp because it is prime and its reverse (96349993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39994369 - 2¹⁷ = 39863297 is a prime.

It is a super-2 number, since 2×39994369² = 3199099103416322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (39994469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19997184 + 19997185.

It is an arithmetic number, because the mean of its divisors is an integer number (19997185).

Almost surely, 2^39994369 is an apocalyptic number.

It is an amenable number.

39994369 is a deficient number, since it is larger than the sum of its proper divisors (1).

39994369 is an equidigital number, since it uses as much as digits as its factorization.

39994369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1417176, while the sum is 52.

The square root of 39994369 is about 6324.1101350309. The cubic root of 39994369 is about 341.9791404580.

The spelling of 39994369 in words is "thirty-nine million, nine hundred ninety-four thousand, three hundred sixty-nine".