1299722157 has 12 divisors (see below), whose sum is σ = 1959001824. Its totient is φ = 828808200.

The previous prime is 1299722153. The next prime is 1299722183. The reversal of 1299722157 is 7512279921.

It is not a de Polignac number, because 1299722157 - 2² = 1299722153 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299722153) 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, 3139219 + ... + 3139632.

It is an arithmetic number, because the mean of its divisors is an integer number (163250152).

Almost surely, 2^1299722157 is an apocalyptic number.

It is an amenable number.

1299722157 is a deficient number, since it is larger than the sum of its proper divisors (659279667).

1299722157 is a wasteful number, since it uses less digits than its factorization.

1299722157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6278880 (or 6278877 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 1299722157 is about 36051.6595595820. The cubic root of 1299722157 is about 1091.3151247333.

The spelling of 1299722157 in words is "one billion, two hundred ninety-nine million, seven hundred twenty-two thousand, one hundred fifty-seven".