31403212 has 24 divisors (see below), whose sum is σ = 56553840. Its totient is φ = 15248640.

The previous prime is 31403173. The next prime is 31403249. The reversal of 31403212 is 21230413.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68488 + ... + 68944.

It is an arithmetic number, because the mean of its divisors is an integer number (2356410).

Almost surely, 2^31403212 is an apocalyptic number.

It is an amenable number.

31403212 is a deficient number, since it is larger than the sum of its proper divisors (25150628).

31403212 is a wasteful number, since it uses less digits than its factorization.

31403212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 919 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31403212 is about 5603.8568861098. The cubic root of 31403212 is about 315.4941835689.

Adding to 31403212 its reverse (21230413), we get a palindrome (52633625).

The spelling of 31403212 in words is "thirty-one million, four hundred three thousand, two hundred twelve".