1299385688836 has 27 divisors (see below), whose sum is σ = 2280699567783. Its totient is φ = 647762983560.

The previous prime is 1299385688833. The next prime is 1299385688837. The reversal of 1299385688836 is 6388865839921.

The square root of 1299385688836 is 1139906.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1299385688831) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1055552341 + ... + 1055553571.

Almost surely, 2^{1299385688836} is an apocalyptic number.

1299385688836 is the 1139906-th square number.

It is an amenable number.

1299385688836 is a deficient number, since it is larger than the sum of its proper divisors (981313878947).

1299385688836 is an frugal number, since it uses more digits than its factorization.

1299385688836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392 (or 1696 counting only the distinct ones).

The product of its digits is 1074954240, while the sum is 76.

The spelling of 1299385688836 in words is "one trillion, two hundred ninety-nine billion, three hundred eighty-five million, six hundred eighty-eight thousand, eight hundred thirty-six".