1257323245 has 8 divisors (see below), whose sum is σ = 1523727000. Its totient is φ = 995899200.

The previous prime is 1257323231. The next prime is 1257323251. The reversal of 1257323245 is 5423237521.

It can be written as a sum of positive squares in 4 ways, for example, as 642977449 + 614345796 = 25357^2 + 24786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1257323245 - 2¹⁷ = 1257192173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1257323245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1244370 + ... + 1245379.

It is an arithmetic number, because the mean of its divisors is an integer number (190465875).

Almost surely, 2^1257323245 is an apocalyptic number.

It is an amenable number.

1257323245 is a deficient number, since it is larger than the sum of its proper divisors (266403755).

1257323245 is a wasteful number, since it uses less digits than its factorization.

1257323245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489855.

The product of its digits is 50400, while the sum is 34.

The square root of 1257323245 is about 35458.7541377302. The cubic root of 1257323245 is about 1079.3169105792.

The spelling of 1257323245 in words is "one billion, two hundred fifty-seven million, three hundred twenty-three thousand, two hundred forty-five".