31406216 has 32 divisors (see below), whose sum is σ = 60412800. Its totient is φ = 15301440.

The previous prime is 31406197. The next prime is 31406233. The reversal of 31406216 is 61260413.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31406191 and 31406200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67601 + ... + 68063.

It is an arithmetic number, because the mean of its divisors is an integer number (1887900).

Almost surely, 2^31406216 is an apocalyptic number.

It is an amenable number.

31406216 is a deficient number, since it is larger than the sum of its proper divisors (29006584).

31406216 is a wasteful number, since it uses less digits than its factorization.

31406216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 31406216 is about 5604.1249093859. The cubic root of 31406216 is about 315.5042432013.

Adding to 31406216 its reverse (61260413), we get a palindrome (92666629).

The spelling of 31406216 in words is "thirty-one million, four hundred six thousand, two hundred sixteen".