39642871 has 2 divisors, whose sum is σ = 39642872. Its totient is φ = 39642870.

The previous prime is 39642851. The next prime is 39642881. The reversal of 39642871 is 17824693.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39642871 - 2¹¹ = 39640823 is a prime.

It is a super-2 number, since 2×39642871² = 3143114442245282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39642821) 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, 19821435 + 19821436.

It is an arithmetic number, because the mean of its divisors is an integer number (19821436).

Almost surely, 2^39642871 is an apocalyptic number.

39642871 is a deficient number, since it is larger than the sum of its proper divisors (1).

39642871 is an equidigital number, since it uses as much as digits as its factorization.

39642871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 39642871 is about 6296.2584921523. The cubic root of 39642871 is about 340.9743418287.

The spelling of 39642871 in words is "thirty-nine million, six hundred forty-two thousand, eight hundred seventy-one".