1268157307 has 4 divisors (see below), whose sum is σ = 1287085096. Its totient is φ = 1249229520.

The previous prime is 1268157301. The next prime is 1268157323. The reversal of 1268157307 is 7037518621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1268157307 - 2⁷ = 1268157179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1268157307.

It is not an unprimeable number, because it can be changed into a prime (1268157301) 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, 9463794 + ... + 9463927.

It is an arithmetic number, because the mean of its divisors is an integer number (321771274).

Almost surely, 2^1268157307 is an apocalyptic number.

1268157307 is a deficient number, since it is larger than the sum of its proper divisors (18927789).

1268157307 is an equidigital number, since it uses as much as digits as its factorization.

1268157307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18927788.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 1268157307 is about 35611.1963713661. The cubic root of 1268157307 is about 1082.4081230259.

The spelling of 1268157307 in words is "one billion, two hundred sixty-eight million, one hundred fifty-seven thousand, three hundred seven".