1257487 has 12 divisors (see below), whose sum is σ = 1596456. Its totient is φ = 979440.

The previous prime is 1257463. The next prime is 1257491. The reversal of 1257487 is 7847521.

It is a happy number.

It is not a de Polignac number, because 1257487 - 2⁷ = 1257359 is a prime.

It is a Duffinian number.

1257487 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 628 + ... + 1705.

It is an arithmetic number, because the mean of its divisors is an integer number (133038).

2^1257487 is an apocalyptic number.

1257487 is a deficient number, since it is larger than the sum of its proper divisors (338969).

1257487 is a wasteful number, since it uses less digits than its factorization.

1257487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358 (or 2351 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The square root of 1257487 is about 1121.3772781718. The cubic root of 1257487 is about 107.9363765639.

Adding to 1257487 its sum of digits (34), we get a palindrome (1257521).

The spelling of 1257487 in words is "one million, two hundred fifty-seven thousand, four hundred eighty-seven".