1257343697 has 8 divisors (see below), whose sum is σ = 1273933440. Its totient is φ = 1240770960.

The previous prime is 1257343687. The next prime is 1257343721. The reversal of 1257343697 is 7963437521.

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

It is a cyclic number.

It is not a de Polignac number, because 1257343697 - 2¹⁰ = 1257342673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257343627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223238 + ... + 228800.

It is an arithmetic number, because the mean of its divisors is an integer number (159241680).

Almost surely, 2^1257343697 is an apocalyptic number.

It is an amenable number.

1257343697 is a deficient number, since it is larger than the sum of its proper divisors (16589743).

1257343697 is an equidigital number, since it uses as much as digits as its factorization.

1257343697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8503.

The product of its digits is 952560, while the sum is 47.

The square root of 1257343697 is about 35459.0425279646. The cubic root of 1257343697 is about 1079.3227627125.

The spelling of 1257343697 in words is "one billion, two hundred fifty-seven million, three hundred forty-three thousand, six hundred ninety-seven".