39992161 has 4 divisors (see below), whose sum is σ = 43627824. Its totient is φ = 36356500.

The previous prime is 39992129. The next prime is 39992221. The reversal of 39992161 is 16129993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39992161 - 2⁵ = 39992129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39992111) 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, 1817815 + ... + 1817836.

It is an arithmetic number, because the mean of its divisors is an integer number (10906956).

Almost surely, 2^39992161 is an apocalyptic number.

It is an amenable number.

39992161 is a deficient number, since it is larger than the sum of its proper divisors (3635663).

39992161 is a wasteful number, since it uses less digits than its factorization.

39992161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3635662.

The product of its digits is 26244, while the sum is 40.

The square root of 39992161 is about 6323.9355626066. The cubic root of 39992161 is about 341.9728470400.

The spelling of 39992161 in words is "thirty-nine million, nine hundred ninety-two thousand, one hundred sixty-one".