39912231 has 4 divisors (see below), whose sum is σ = 53216312. Its totient is φ = 26608152.

The previous prime is 39912227. The next prime is 39912241. The reversal of 39912231 is 13221993.

It is a happy number.

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

It is not a de Polignac number, because 39912231 - 2² = 39912227 is a prime.

It is a super-2 number, since 2×39912231² = 3185972366794722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39912211) 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, 6652036 + ... + 6652041.

It is an arithmetic number, because the mean of its divisors is an integer number (13304078).

Almost surely, 2^39912231 is an apocalyptic number.

39912231 is a deficient number, since it is larger than the sum of its proper divisors (13304081).

39912231 is a wasteful number, since it uses less digits than its factorization.

39912231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13304080.

The product of its digits is 2916, while the sum is 30.

The square root of 39912231 is about 6317.6127611622. The cubic root of 39912231 is about 341.7448680274.

The spelling of 39912231 in words is "thirty-nine million, nine hundred twelve thousand, two hundred thirty-one".