231930012 has 12 divisors (see below), whose sum is σ = 541170056. Its totient is φ = 77310000.

The previous prime is 231930011. The next prime is 231930019. The reversal of 231930012 is 210039132.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231930011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9663739 + ... + 9663762.

Almost surely, 2^231930012 is an apocalyptic number.

It is an amenable number.

231930012 is an abundant number, since it is smaller than the sum of its proper divisors (309240044).

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

231930012 is a wasteful number, since it uses less digits than its factorization.

231930012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19327508 (or 19327506 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 231930012 is about 15229.2485697752. The cubic root of 231930012 is about 614.4015700406.

Adding to 231930012 its reverse (210039132), we get a palindrome (441969144).

The spelling of 231930012 in words is "two hundred thirty-one million, nine hundred thirty thousand, twelve".