1287045 has 24 divisors (see below), whose sum is σ = 2294136. Its totient is φ = 667008.

The previous prime is 1287007. The next prime is 1287047. The reversal of 1287045 is 5407821.

It can be written as a sum of positive squares in 4 ways, for example, as 101124 + 1185921 = 318^2 + 1089^2 .

It is not a de Polignac number, because 1287045 - 2⁶ = 1286981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1279 + ... + 2051.

It is an arithmetic number, because the mean of its divisors is an integer number (95589).

2^1287045 is an apocalyptic number.

1287045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1287045 is a deficient number, since it is larger than the sum of its proper divisors (1007091).

1287045 is a wasteful number, since it uses less digits than its factorization.

1287045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1287045 is about 1134.4800571187. The cubic root of 1287045 is about 108.7755389880.

The spelling of 1287045 in words is "one million, two hundred eighty-seven thousand, forty-five".