39971231 has 4 divisors (see below), whose sum is σ = 42075000. Its totient is φ = 37867464.

The previous prime is 39971227. The next prime is 39971297. The reversal of 39971231 is 13217993.

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 39971231 - 2² = 39971227 is a prime.

It is a super-2 number, since 2×39971231² = 3195398615310722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39971191 and 39971200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39973231) 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, 1051856 + ... + 1051893.

It is an arithmetic number, because the mean of its divisors is an integer number (10518750).

Almost surely, 2^39971231 is an apocalyptic number.

39971231 is a deficient number, since it is larger than the sum of its proper divisors (2103769).

39971231 is a wasteful number, since it uses less digits than its factorization.

39971231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103768.

The product of its digits is 10206, while the sum is 35.

The square root of 39971231 is about 6322.2805220901. The cubic root of 39971231 is about 341.9131791743.

The spelling of 39971231 in words is "thirty-nine million, nine hundred seventy-one thousand, two hundred thirty-one".