31040423 has 4 divisors (see below), whose sum is σ = 31414488. Its totient is φ = 30666360.

The previous prime is 31040413. The next prime is 31040459. The reversal of 31040423 is 32404013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32404013 = 1327 ⋅24419.

It is a cyclic number.

It is not a de Polignac number, because 31040423 - 2⁴ = 31040407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31040413) 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, 186908 + ... + 187073.

It is an arithmetic number, because the mean of its divisors is an integer number (7853622).

Almost surely, 2^31040423 is an apocalyptic number.

31040423 is a deficient number, since it is larger than the sum of its proper divisors (374065).

31040423 is an equidigital number, since it uses as much as digits as its factorization.

31040423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374064.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31040423 is about 5571.3932727820. The cubic root of 31040423 is about 314.2745479012.

Adding to 31040423 its reverse (32404013), we get a palindrome (63444436).

The spelling of 31040423 in words is "thirty-one million, forty thousand, four hundred twenty-three".