39642943 has 2 divisors, whose sum is σ = 39642944. Its totient is φ = 39642942.

The previous prime is 39642937. The next prime is 39642979. The reversal of 39642943 is 34924693.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39642943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39642896 and 39642905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39642983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19821471 + 19821472.

It is an arithmetic number, because the mean of its divisors is an integer number (19821472).

Almost surely, 2^39642943 is an apocalyptic number.

39642943 is a deficient number, since it is larger than the sum of its proper divisors (1).

39642943 is an equidigital number, since it uses as much as digits as its factorization.

39642943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 40.

The square root of 39642943 is about 6296.2642098311. The cubic root of 39642943 is about 340.9745482562.

The spelling of 39642943 in words is "thirty-nine million, six hundred forty-two thousand, nine hundred forty-three".