31424216 has 8 divisors (see below), whose sum is σ = 58920420. Its totient is φ = 15712104.

The previous prime is 31424207. The next prime is 31424221. The reversal of 31424216 is 61242413.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 31424191 and 31424200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1964006 + ... + 1964021.

Almost surely, 2^31424216 is an apocalyptic number.

It is an amenable number.

31424216 is a deficient number, since it is larger than the sum of its proper divisors (27496204).

31424216 is a wasteful number, since it uses less digits than its factorization.

31424216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928033 (or 3928029 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 31424216 is about 5605.7306392655. The cubic root of 31424216 is about 315.5645071924.

Adding to 31424216 its reverse (61242413), we get a palindrome (92666629).

The spelling of 31424216 in words is "thirty-one million, four hundred twenty-four thousand, two hundred sixteen".