31430012 has 6 divisors (see below), whose sum is σ = 55002528. Its totient is φ = 15715004.

The previous prime is 31430011. The next prime is 31430017. The reversal of 31430012 is 21003413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31430011) by changing a digit.

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 as a sum of consecutive naturals, namely, 3928748 + ... + 3928755.

It is an arithmetic number, because the mean of its divisors is an integer number (9167088).

Almost surely, 2^31430012 is an apocalyptic number.

It is an amenable number.

31430012 is a deficient number, since it is larger than the sum of its proper divisors (23572516).

31430012 is a wasteful number, since it uses less digits than its factorization.

31430012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7857507 (or 7857505 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31430012 is about 5606.2475863986. The cubic root of 31430012 is about 315.5839072993.

Adding to 31430012 its reverse (21003413), we get a palindrome (52433425).

The spelling of 31430012 in words is "thirty-one million, four hundred thirty thousand, twelve".