39442891 has 2 divisors, whose sum is σ = 39442892. Its totient is φ = 39442890.

The previous prime is 39442889. The next prime is 39442901. The reversal of 39442891 is 19824493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39442891 - 2¹ = 39442889 is a prime.

Together with 39442889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39442801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19721445 + 19721446.

It is an arithmetic number, because the mean of its divisors is an integer number (19721446).

Almost surely, 2^39442891 is an apocalyptic number.

39442891 is a deficient number, since it is larger than the sum of its proper divisors (1).

39442891 is an equidigital number, since it uses as much as digits as its factorization.

39442891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 39442891 is about 6280.3575535156. The cubic root of 39442891 is about 340.4000222544.

The spelling of 39442891 in words is "thirty-nine million, four hundred forty-two thousand, eight hundred ninety-one".