1239970812 has 12 divisors (see below), whose sum is σ = 2893265256. Its totient is φ = 413323600.

The previous prime is 1239970793. The next prime is 1239970813. The reversal of 1239970812 is 2180799321.

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

It is a super-2 number, since 2×1239970812² = 3075055229223878688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239970813) 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, 51665439 + ... + 51665462.

It is an arithmetic number, because the mean of its divisors is an integer number (241105438).

Almost surely, 2^1239970812 is an apocalyptic number.

1239970812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1239970812 is an abundant number, since it is smaller than the sum of its proper divisors (1653294444).

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

1239970812 is a wasteful number, since it uses less digits than its factorization.

1239970812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103330908 (or 103330906 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1239970812 is about 35213.2192791287. The cubic root of 1239970812 is about 1074.3286414200.

The spelling of 1239970812 in words is "one billion, two hundred thirty-nine million, nine hundred seventy thousand, eight hundred twelve".