1239668740 has 12 divisors (see below), whose sum is σ = 2603304396. Its totient is φ = 495867488.

The previous prime is 1239668707. The next prime is 1239668741. The reversal of 1239668740 is 478669321.

It can be written as a sum of positive squares in 2 ways, for example, as 291521476 + 948147264 = 17074^2 + 30792^2 .

It is not an unprimeable number, because it can be changed into a prime (1239668741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30991699 + ... + 30991738.

It is an arithmetic number, because the mean of its divisors is an integer number (216942033).

Almost surely, 2^1239668740 is an apocalyptic number.

1239668740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1239668740 is an abundant number, since it is smaller than the sum of its proper divisors (1363635656).

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

1239668740 is a wasteful number, since it uses less digits than its factorization.

1239668740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61983446 (or 61983444 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 1239668740 is about 35208.9298332113. The cubic root of 1239668740 is about 1074.2413944853.

The spelling of 1239668740 in words is "one billion, two hundred thirty-nine million, six hundred sixty-eight thousand, seven hundred forty".