39081891 has 8 divisors (see below), whose sum is σ = 52142080. Its totient is φ = 26038152.

The previous prime is 39081881. The next prime is 39081919. The reversal of 39081891 is 19818093.

It is a happy number.

39081891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39081891 - 2⁵ = 39081859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39081811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3390 + ... + 9468.

It is an arithmetic number, because the mean of its divisors is an integer number (6517760).

Almost surely, 2^39081891 is an apocalyptic number.

39081891 is a deficient number, since it is larger than the sum of its proper divisors (13060189).

39081891 is a wasteful number, since it uses less digits than its factorization.

39081891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8225.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 39081891 is about 6251.5510875302. The cubic root of 39081891 is about 339.3583370769.

The spelling of 39081891 in words is "thirty-nine million, eighty-one thousand, eight hundred ninety-one".