1299766749 has 4 divisors (see below), whose sum is σ = 1733022336. Its totient is φ = 866511164.

The previous prime is 1299766703. The next prime is 1299766751. The reversal of 1299766749 is 9476679921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1299766749 - 2¹³ = 1299758557 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1299766692 and 1299766701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299766049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216627789 + ... + 216627794.

It is an arithmetic number, because the mean of its divisors is an integer number (433255584).

Almost surely, 2^1299766749 is an apocalyptic number.

It is an amenable number.

1299766749 is a deficient number, since it is larger than the sum of its proper divisors (433255587).

1299766749 is an equidigital number, since it uses as much as digits as its factorization.

1299766749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433255586.

The product of its digits is 10287648, while the sum is 60.

The square root of 1299766749 is about 36052.2780001486. The cubic root of 1299766749 is about 1091.3276051872.

The spelling of 1299766749 in words is "one billion, two hundred ninety-nine million, seven hundred sixty-six thousand, seven hundred forty-nine".