31423423 has 4 divisors (see below), whose sum is σ = 31734648. Its totient is φ = 31112200.

The previous prime is 31423421. The next prime is 31423433. The reversal of 31423423 is 32432413.

It is a happy number.

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 31423423 - 2¹ = 31423421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31423394 and 31423403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423421) 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, 155461 + ... + 155662.

It is an arithmetic number, because the mean of its divisors is an integer number (7933662).

Almost surely, 2^31423423 is an apocalyptic number.

31423423 is a deficient number, since it is larger than the sum of its proper divisors (311225).

31423423 is a wasteful number, since it uses less digits than its factorization.

31423423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311224.

The product of its digits is 1728, while the sum is 22.

The square root of 31423423 is about 5605.6599076291. The cubic root of 31423423 is about 315.5618527135.

Adding to 31423423 its reverse (32432413), we get a palindrome (63855836).

The spelling of 31423423 in words is "thirty-one million, four hundred twenty-three thousand, four hundred twenty-three".