1283639 has 4 divisors (see below), whose sum is σ = 1467024. Its totient is φ = 1100256.

The previous prime is 1283603. The next prime is 1283677. The reversal of 1283639 is 9363821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9363821 = 17 ⋅550813.

It is a cyclic number.

It is not a de Polignac number, because 1283639 - 2⁸ = 1283383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1283339) 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, 91682 + ... + 91695.

It is an arithmetic number, because the mean of its divisors is an integer number (366756).

2^1283639 is an apocalyptic number.

1283639 is a deficient number, since it is larger than the sum of its proper divisors (183385).

1283639 is an equidigital number, since it uses as much as digits as its factorization.

1283639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183384.

The product of its digits is 7776, while the sum is 32.

The square root of 1283639 is about 1132.9779344718. The cubic root of 1283639 is about 108.6795007027.

The spelling of 1283639 in words is "one million, two hundred eighty-three thousand, six hundred thirty-nine".