31223394 has 20 divisors (see below), whose sum is σ = 69963894. Its totient is φ = 10407744.

The previous prime is 31223389. The next prime is 31223411. The reversal of 31223394 is 49332213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15896169 + 15327225 = 3987^2 + 3915^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 96207 + ... + 96530.

Almost surely, 2^31223394 is an apocalyptic number.

31223394 is an abundant number, since it is smaller than the sum of its proper divisors (38740500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31223394 is a wasteful number, since it uses less digits than its factorization.

31223394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192751 (or 192742 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 31223394 is about 5587.7897240322. The cubic root of 31223394 is about 314.8908465344.

The spelling of 31223394 in words is "thirty-one million, two hundred twenty-three thousand, three hundred ninety-four".