1257979853 has 4 divisors (see below), whose sum is σ = 1354747548. Its totient is φ = 1161212160.

The previous prime is 1257979843. The next prime is 1257979867. The reversal of 1257979853 is 3589797521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 202834564 + 1055145289 = 14242^2 + 32483^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257979853 - 2³⁰ = 184238029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257979813) 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, 48383828 + ... + 48383853.

It is an arithmetic number, because the mean of its divisors is an integer number (338686887).

Almost surely, 2^1257979853 is an apocalyptic number.

1257979853 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1257979853 is a deficient number, since it is larger than the sum of its proper divisors (96767695).

1257979853 is an equidigital number, since it uses as much as digits as its factorization.

1257979853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96767694.

The product of its digits is 4762800, while the sum is 56.

The square root of 1257979853 is about 35468.0116865888. The cubic root of 1257979853 is about 1079.5047606517.

The spelling of 1257979853 in words is "one billion, two hundred fifty-seven million, nine hundred seventy-nine thousand, eight hundred fifty-three".