1287145 has 8 divisors (see below), whose sum is σ = 1557504. Its totient is φ = 1021104.

The previous prime is 1287133. The next prime is 1287157. The reversal of 1287145 is 5417821.

It is an interprime number because it is at equal distance from previous prime (1287133) and next prime (1287157).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1287145 - 2⁹ = 1286633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379 + ... + 1648.

It is an arithmetic number, because the mean of its divisors is an integer number (194688).

2^1287145 is an apocalyptic number.

It is an amenable number.

1287145 is a deficient number, since it is larger than the sum of its proper divisors (270359).

1287145 is a wasteful number, since it uses less digits than its factorization.

1287145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159.

The product of its digits is 2240, while the sum is 28.

The square root of 1287145 is about 1134.5241293159. The cubic root of 1287145 is about 108.7783561059.

The spelling of 1287145 in words is "one million, two hundred eighty-seven thousand, one hundred forty-five".