1207557857 has 6 divisors (see below), whose sum is σ = 1327315794. Its totient is φ = 1097779760.

The previous prime is 1207557833. The next prime is 1207557877. The reversal of 1207557857 is 7587557021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 645109201 + 562448656 = 25399^2 + 23716^2 .

It is not a de Polignac number, because 1207557857 - 2²⁰ = 1206509281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1207557877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4989788 + ... + 4990029.

It is an arithmetic number, because the mean of its divisors is an integer number (221219299).

Almost surely, 2^1207557857 is an apocalyptic number.

It is an amenable number.

1207557857 is a deficient number, since it is larger than the sum of its proper divisors (119757937).

1207557857 is an equidigital number, since it uses as much as digits as its factorization.

1207557857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9979839 (or 9979828 counting only the distinct ones).

The product of its (nonzero) digits is 686000, while the sum is 47.

The square root of 1207557857 is about 34749.9331941804. The cubic root of 1207557857 is about 1064.8848522527.

The spelling of 1207557857 in words is "one billion, two hundred seven million, five hundred fifty-seven thousand, eight hundred fifty-seven".