1283643 has 12 divisors (see below), whose sum is σ = 1866280. Its totient is φ = 850176.

The previous prime is 1283603. The next prime is 1283677. The reversal of 1283643 is 3463821.

It is a happy number.

1283643 is a `hidden beast` number, since 12 + 8 + 3 + 643 = 666.

It is not a de Polignac number, because 1283643 - 2¹² = 1279547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1283603) 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, 1368 + ... + 2106.

2^1283643 is an apocalyptic number.

1283643 is a deficient number, since it is larger than the sum of its proper divisors (582637).

1283643 is a wasteful number, since it uses less digits than its factorization.

1283643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938 (or 935 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 1283643 is about 1132.9796997299. The cubic root of 1283643 is about 108.6796135895.

The spelling of 1283643 in words is "one million, two hundred eighty-three thousand, six hundred forty-three".