31430212 has 24 divisors (see below), whose sum is σ = 63534240. Its totient is φ = 13445760.

The previous prime is 31430183. The next prime is 31430221. The reversal of 31430212 is 21203413.

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, 20262 + ... + 21757.

It is an arithmetic number, because the mean of its divisors is an integer number (2647260).

Almost surely, 2^31430212 is an apocalyptic number.

It is an amenable number.

31430212 is an abundant number, since it is smaller than the sum of its proper divisors (32104028).

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

31430212 is a wasteful number, since it uses less digits than its factorization.

31430212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42051 (or 42049 counting only the distinct ones).

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

The square root of 31430212 is about 5606.2654236131. The cubic root of 31430212 is about 315.5845766876.

Adding to 31430212 its reverse (21203413), we get a palindrome (52633625).

The spelling of 31430212 in words is "thirty-one million, four hundred thirty thousand, two hundred twelve".