1299785723 has 2 divisors, whose sum is σ = 1299785724. Its totient is φ = 1299785722.

The previous prime is 1299785699. The next prime is 1299785759. The reversal of 1299785723 is 3275879921.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3275879921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1299785723 is a prime.

It is not a weakly prime, because it can be changed into another prime (1299785783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649892861 + 649892862.

It is an arithmetic number, because the mean of its divisors is an integer number (649892862).

Almost surely, 2^1299785723 is an apocalyptic number.

1299785723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299785723 is an equidigital number, since it uses as much as digits as its factorization.

1299785723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 53.

The square root of 1299785723 is about 36052.5411448347. The cubic root of 1299785723 is about 1091.3329155629.

The spelling of 1299785723 in words is "one billion, two hundred ninety-nine million, seven hundred eighty-five thousand, seven hundred twenty-three".