1239540012 has 72 divisors (see below), whose sum is σ = 3441634560. Its totient is φ = 374410080.

The previous prime is 1239539881. The next prime is 1239540013. The reversal of 1239540012 is 2100459321.

It is not an unprimeable number, because it can be changed into a prime (1239540013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23664 + ... + 55127.

It is an arithmetic number, because the mean of its divisors is an integer number (47800480).

Almost surely, 2^1239540012 is an apocalyptic number.

1239540012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1239540012 is an abundant number, since it is smaller than the sum of its proper divisors (2202094548).

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

1239540012 is a wasteful number, since it uses less digits than its factorization.

1239540012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78843 (or 78838 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1239540012 is about 35207.1017267823. The cubic root of 1239540012 is about 1074.2042098921.

Adding to 1239540012 its reverse (2100459321), we get a palindrome (3339999333).

The spelling of 1239540012 in words is "one billion, two hundred thirty-nine million, five hundred forty thousand, twelve".