1297239885 has 12 divisors (see below), whose sum is σ = 2248549212. Its totient is φ = 691861248.

The previous prime is 1297239883. The next prime is 1297239899. The reversal of 1297239885 is 5889327921.

It can be written as a sum of positive squares in 2 ways, for example, as 422795844 + 874444041 = 20562^2 + 29571^2 .

It is not a de Polignac number, because 1297239885 - 2¹ = 1297239883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297239883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14413732 + ... + 14413821.

It is an arithmetic number, because the mean of its divisors is an integer number (187379101).

Almost surely, 2^1297239885 is an apocalyptic number.

1297239885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1297239885 is a deficient number, since it is larger than the sum of its proper divisors (951309327).

1297239885 is a wasteful number, since it uses less digits than its factorization.

1297239885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28827564 (or 28827561 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 1297239885 is about 36017.2165082201. The cubic root of 1297239885 is about 1090.6199332392.

The spelling of 1297239885 in words is "one billion, two hundred ninety-seven million, two hundred thirty-nine thousand, eight hundred eighty-five".