39891371 has 4 divisors (see below), whose sum is σ = 42959952. Its totient is φ = 36822792.

The previous prime is 39891359. The next prime is 39891413. The reversal of 39891371 is 17319893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 39891371 - 2⁶ = 39891307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39891301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1534271 + ... + 1534296.

It is an arithmetic number, because the mean of its divisors is an integer number (10739988).

Almost surely, 2^39891371 is an apocalyptic number.

39891371 is a deficient number, since it is larger than the sum of its proper divisors (3068581).

39891371 is a wasteful number, since it uses less digits than its factorization.

39891371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068580.

The product of its digits is 40824, while the sum is 41.

The square root of 39891371 is about 6315.9616053298. The cubic root of 39891371 is about 341.6853203643.

The spelling of 39891371 in words is "thirty-nine million, eight hundred ninety-one thousand, three hundred seventy-one".