39157971 has 4 divisors (see below), whose sum is σ = 52210632. Its totient is φ = 26105312.

The previous prime is 39157961. The next prime is 39157973. The reversal of 39157971 is 17975193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17975193 = 3 ⋅5991731.

It is a cyclic number.

It is not a de Polignac number, because 39157971 - 2⁵ = 39157939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39157973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6526326 + ... + 6526331.

It is an arithmetic number, because the mean of its divisors is an integer number (13052658).

Almost surely, 2^39157971 is an apocalyptic number.

39157971 is a deficient number, since it is larger than the sum of its proper divisors (13052661).

39157971 is a wasteful number, since it uses less digits than its factorization.

39157971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13052660.

The product of its digits is 59535, while the sum is 42.

The square root of 39157971 is about 6257.6330189617. The cubic root of 39157971 is about 339.5784018889.

The spelling of 39157971 in words is "thirty-nine million, one hundred fifty-seven thousand, nine hundred seventy-one".