1257674993 has 4 divisors (see below), whose sum is σ = 1261642740. Its totient is φ = 1253707248.

The previous prime is 1257674969. The next prime is 1257675017. The reversal of 1257674993 is 3994767521.

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

It is an interprime number because it is at equal distance from previous prime (1257674969) and next prime (1257675017).

It can be written as a sum of positive squares in 2 ways, for example, as 281299984 + 976375009 = 16772^2 + 31247^2 .

It is a cyclic number.

It is not a de Polignac number, because 1257674993 - 2¹⁰ = 1257673969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257674903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1983398 + ... + 1984031.

It is an arithmetic number, because the mean of its divisors is an integer number (315410685).

Almost surely, 2^1257674993 is an apocalyptic number.

It is an amenable number.

1257674993 is a deficient number, since it is larger than the sum of its proper divisors (3967747).

1257674993 is an equidigital number, since it uses as much as digits as its factorization.

1257674993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967746.

The product of its digits is 2857680, while the sum is 53.

The square root of 1257674993 is about 35463.7137508186. The cubic root of 1257674993 is about 1079.4175508795.

The spelling of 1257674993 in words is "one billion, two hundred fifty-seven million, six hundred seventy-four thousand, nine hundred ninety-three".