39742399 has 2 divisors, whose sum is σ = 39742400. Its totient is φ = 39742398.

The previous prime is 39742397. The next prime is 39742453. The reversal of 39742399 is 99324793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39742399 - 2¹ = 39742397 is a prime.

Together with 39742397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39742393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19871199 + 19871200.

It is an arithmetic number, because the mean of its divisors is an integer number (19871200).

Almost surely, 2^39742399 is an apocalyptic number.

39742399 is a deficient number, since it is larger than the sum of its proper divisors (1).

39742399 is an equidigital number, since it uses as much as digits as its factorization.

39742399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 46.

The square root of 39742399 is about 6304.1572791294. The cubic root of 39742399 is about 341.2594551625.

The spelling of 39742399 in words is "thirty-nine million, seven hundred forty-two thousand, three hundred ninety-nine".