31906423 has 4 divisors (see below), whose sum is σ = 32009328. Its totient is φ = 31803520.

The previous prime is 31906421. The next prime is 31906429. The reversal of 31906423 is 32460913.

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 31906423 - 2¹ = 31906421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31906391 and 31906400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31906421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50986 + ... + 51607.

It is an arithmetic number, because the mean of its divisors is an integer number (8002332).

Almost surely, 2^31906423 is an apocalyptic number.

31906423 is a deficient number, since it is larger than the sum of its proper divisors (102905).

31906423 is a wasteful number, since it uses less digits than its factorization.

31906423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102904.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 31906423 is about 5648.5770774594. The cubic root of 31906423 is about 317.1704411041.

The spelling of 31906423 in words is "thirty-one million, nine hundred six thousand, four hundred twenty-three".