31289423 has 16 divisors (see below), whose sum is σ = 35392896. Its totient is φ = 27414240.

The previous prime is 31289417. The next prime is 31289441. The reversal of 31289423 is 32498213.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31289423 - 2¹⁰ = 31288399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31289423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31289413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38861 + ... + 39657.

It is an arithmetic number, because the mean of its divisors is an integer number (2212056).

Almost surely, 2^31289423 is an apocalyptic number.

31289423 is a deficient number, since it is larger than the sum of its proper divisors (4103473).

31289423 is a wasteful number, since it uses less digits than its factorization.

31289423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934.

The product of its digits is 10368, while the sum is 32.

The square root of 31289423 is about 5593.6949326898. The cubic root of 31289423 is about 315.1126597948.

The spelling of 31289423 in words is "thirty-one million, two hundred eighty-nine thousand, four hundred twenty-three".