31423223 has 16 divisors (see below), whose sum is σ = 35108640. Its totient is φ = 27940224.

The previous prime is 31423187. The next prime is 31423237. The reversal of 31423223 is 32232413.

It is not a de Polignac number, because 31423223 - 2⁶ = 31423159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31423195 and 31423204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40265 + ... + 41037.

It is an arithmetic number, because the mean of its divisors is an integer number (2194290).

Almost surely, 2^31423223 is an apocalyptic number.

31423223 is a deficient number, since it is larger than the sum of its proper divisors (3685417).

31423223 is a wasteful number, since it uses less digits than its factorization.

31423223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898.

The product of its digits is 864, while the sum is 20.

The square root of 31423223 is about 5605.6420684878. The cubic root of 31423223 is about 315.5611832287.

Adding to 31423223 its reverse (32232413), we get a palindrome (63655636).

The spelling of 31423223 in words is "thirty-one million, four hundred twenty-three thousand, two hundred twenty-three".