1257506 has 4 divisors (see below), whose sum is σ = 1886262. Its totient is φ = 628752.

The previous prime is 1257499. The next prime is 1257517. The reversal of 1257506 is 6057521.

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

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 36481 = 1105^2 + 191^2 .

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314375 + ... + 314378.

2^1257506 is an apocalyptic number.

1257506 is a deficient number, since it is larger than the sum of its proper divisors (628756).

1257506 is an equidigital number, since it uses as much as digits as its factorization.

1257506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628755.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 1257506 is about 1121.3857498649. The cubic root of 1257506 is about 107.9369201827.

The spelling of 1257506 in words is "one million, two hundred fifty-seven thousand, five hundred six".