31442823 has 10 divisors (see below), whose sum is σ = 46970264. Its totient is φ = 20961828.

The previous prime is 31442821. The next prime is 31442839. The reversal of 31442823 is 32824413.

It is not a de Polignac number, because 31442823 - 2¹ = 31442821 is a prime.

It is a super-2 number, since 2×31442823² = 1977302236418658, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442821) 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 9 ways as a sum of consecutive naturals, for example, 194011 + ... + 194172.

Almost surely, 2^31442823 is an apocalyptic number.

31442823 is a deficient number, since it is larger than the sum of its proper divisors (15527441).

31442823 is an equidigital number, since it uses as much as digits as its factorization.

31442823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388195 (or 388186 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 31442823 is about 5607.3900345883. The cubic root of 31442823 is about 315.6267792338.

The spelling of 31442823 in words is "thirty-one million, four hundred forty-two thousand, eight hundred twenty-three".