1257349823 has 2 divisors, whose sum is σ = 1257349824. Its totient is φ = 1257349822.

The previous prime is 1257349811. The next prime is 1257349853. The reversal of 1257349823 is 3289437521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1257349823 - 2¹⁴ = 1257333439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1257349853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628674911 + 628674912.

It is an arithmetic number, because the mean of its divisors is an integer number (628674912).

Almost surely, 2^1257349823 is an apocalyptic number.

1257349823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1257349823 is an equidigital number, since it uses as much as digits as its factorization.

1257349823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 44.

The square root of 1257349823 is about 35459.1289092104. The cubic root of 1257349823 is about 1079.3245155932.

The spelling of 1257349823 in words is "one billion, two hundred fifty-seven million, three hundred forty-nine thousand, eight hundred twenty-three".