31420423 has 4 divisors (see below), whose sum is σ = 31431640. Its totient is φ = 31409208.

The previous prime is 31420409. The next prime is 31420447. The reversal of 31420423 is 32402413.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32402413 = 2521 ⋅12853.

It is a cyclic number.

It is not a de Polignac number, because 31420423 - 2¹⁷ = 31289351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31420423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420463) 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, 2548 + ... + 8326.

It is an arithmetic number, because the mean of its divisors is an integer number (7857910).

Almost surely, 2^31420423 is an apocalyptic number.

31420423 is a deficient number, since it is larger than the sum of its proper divisors (11217).

31420423 is an equidigital number, since it uses as much as digits as its factorization.

31420423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11216.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 31420423 is about 5605.3923145486. The cubic root of 31420423 is about 315.5518101444.

Adding to 31420423 its reverse (32402413), we get a palindrome (63822836).

The spelling of 31420423 in words is "thirty-one million, four hundred twenty thousand, four hundred twenty-three".