39642937 has 2 divisors, whose sum is σ = 39642938. Its totient is φ = 39642936.

The previous prime is 39642919. The next prime is 39642943. The reversal of 39642937 is 73924693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39175081 + 467856 = 6259^2 + 684^2 .

It is an emirp because it is prime and its reverse (73924693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39642937 - 2²³ = 31254329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39642893 and 39642902.

It is not a weakly prime, because it can be changed into another prime (39642907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19821468 + 19821469.

It is an arithmetic number, because the mean of its divisors is an integer number (19821469).

Almost surely, 2^39642937 is an apocalyptic number.

It is an amenable number.

39642937 is a deficient number, since it is larger than the sum of its proper divisors (1).

39642937 is an equidigital number, since it uses as much as digits as its factorization.

39642937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 43.

The square root of 39642937 is about 6296.2637333581. The cubic root of 39642937 is about 340.9745310539.

The spelling of 39642937 in words is "thirty-nine million, six hundred forty-two thousand, nine hundred thirty-seven".