1286993 has 4 divisors (see below), whose sum is σ = 1289268. Its totient is φ = 1284720.

The previous prime is 1286983. The next prime is 1287007. The reversal of 1286993 is 3996821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3996821 = 19 ⋅210359.

It can be written as a sum of positive squares in 2 ways, for example, as 380689 + 906304 = 617^2 + 952^2 .

It is a cyclic number.

It is not a de Polignac number, because 1286993 - 2¹⁰ = 1285969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1286953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455 + ... + 1667.

It is an arithmetic number, because the mean of its divisors is an integer number (322317).

2^1286993 is an apocalyptic number.

It is an amenable number.

1286993 is a deficient number, since it is larger than the sum of its proper divisors (2275).

1286993 is a wasteful number, since it uses less digits than its factorization.

1286993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274.

The product of its digits is 23328, while the sum is 38.

The square root of 1286993 is about 1134.4571388995. The cubic root of 1286993 is about 108.7740740291.

The spelling of 1286993 in words is "one million, two hundred eighty-six thousand, nine hundred ninety-three".