1287457 has 2 divisors, whose sum is σ = 1287458. Its totient is φ = 1287456.

The previous prime is 1287431. The next prime is 1287467. The reversal of 1287457 is 7547821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1079521 + 207936 = 1039^2 + 456^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287457 - 2⁷ = 1287329 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643728 + 643729.

It is an arithmetic number, because the mean of its divisors is an integer number (643729).

2^1287457 is an apocalyptic number.

It is an amenable number.

1287457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287457 is an equidigital number, since it uses as much as digits as its factorization.

1287457 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1287457 is about 1134.6616235689. The cubic root of 1287457 is about 108.7871445758.

The spelling of 1287457 in words is "one million, two hundred eighty-seven thousand, four hundred fifty-seven".