39885091 has 2 divisors, whose sum is σ = 39885092. Its totient is φ = 39885090.

The previous prime is 39885089. The next prime is 39885103. The reversal of 39885091 is 19058893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39885091 - 2¹ = 39885089 is a prime.

Together with 39885089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39885061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19942545 + 19942546.

It is an arithmetic number, because the mean of its divisors is an integer number (19942546).

Almost surely, 2^39885091 is an apocalyptic number.

39885091 is a deficient number, since it is larger than the sum of its proper divisors (1).

39885091 is an equidigital number, since it uses as much as digits as its factorization.

39885091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 39885091 is about 6315.4644326447. The cubic root of 39885091 is about 341.6673891980.

The spelling of 39885091 in words is "thirty-nine million, eight hundred eighty-five thousand, ninety-one".