31423216 has 30 divisors (see below), whose sum is σ = 66924536. Its totient is φ = 14282400.

The previous prime is 31423187. The next prime is 31423237. The reversal of 31423216 is 61232413.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 6180 + ... + 10051.

Almost surely, 2^31423216 is an apocalyptic number.

It is an amenable number.

31423216 is an abundant number, since it is smaller than the sum of its proper divisors (35501320).

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

31423216 is a wasteful number, since it uses less digits than its factorization.

31423216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16261 (or 16244 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 31423216 is about 5605.6414441168. The cubic root of 31423216 is about 315.5611597967.

Adding to 31423216 its reverse (61232413), we get a palindrome (92655629).

The spelling of 31423216 in words is "thirty-one million, four hundred twenty-three thousand, two hundred sixteen".