1286661 has 8 divisors (see below), whose sum is σ = 1805920. Its totient is φ = 812592.

The previous prime is 1286657. The next prime is 1286669. The reversal of 1286661 is 1666821.

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

It is not a de Polignac number, because 1286661 - 2² = 1286657 is a prime.

It is a Duffinian number.

1286661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11230 + ... + 11343.

It is an arithmetic number, because the mean of its divisors is an integer number (225740).

2^1286661 is an apocalyptic number.

It is an amenable number.

1286661 is a deficient number, since it is larger than the sum of its proper divisors (519259).

1286661 is a wasteful number, since it uses less digits than its factorization.

1286661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22595.

The product of its digits is 3456, while the sum is 30.

The square root of 1286661 is about 1134.3108039686. The cubic root of 1286661 is about 108.7647198994.

The spelling of 1286661 in words is "one million, two hundred eighty-six thousand, six hundred sixty-one".