1257389 has 12 divisors (see below), whose sum is σ = 1488384. Its totient is φ = 1058904.

The previous prime is 1257359. The next prime is 1257397. The reversal of 1257389 is 9837521.

It is a de Polignac number, because none of the positive numbers 2^k-1257389 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 (1257359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3092 + ... + 3474.

It is an arithmetic number, because the mean of its divisors is an integer number (124032).

2^1257389 is an apocalyptic number.

It is an amenable number.

1257389 is a deficient number, since it is larger than the sum of its proper divisors (230995).

1257389 is an equidigital number, since it uses as much as digits as its factorization.

1257389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464 (or 457 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 1257389 is about 1121.3335810543. Note that the first 3 decimals coincide. The cubic root of 1257389 is about 107.9335725483.

The spelling of 1257389 in words is "one million, two hundred fifty-seven thousand, three hundred eighty-nine".