1287057 has 12 divisors (see below), whose sum is σ = 1796144. Its totient is φ = 819720.

The previous prime is 1287047. The next prime is 1287059. The reversal of 1287057 is 7507821.

It is a happy number.

It is not a de Polignac number, because 1287057 - 2¹² = 1282961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287059) 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, 1182 + ... + 1992.

2^1287057 is an apocalyptic number.

It is an amenable number.

1287057 is a deficient number, since it is larger than the sum of its proper divisors (509087).

1287057 is an equidigital number, since it uses as much as digits as its factorization.

1287057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 1287057 is about 1134.4853458727. The cubic root of 1287057 is about 108.7758770499.

The spelling of 1287057 in words is "one million, two hundred eighty-seven thousand, fifty-seven".