1283987 has 4 divisors (see below), whose sum is σ = 1300320. Its totient is φ = 1267656.

The previous prime is 1283983. The next prime is 1284007. The reversal of 1283987 is 7893821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1283987 - 2² = 1283983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1283987.

It is not an unprimeable number, because it can be changed into a prime (1283981) 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, 8048 + ... + 8205.

It is an arithmetic number, because the mean of its divisors is an integer number (325080).

2^1283987 is an apocalyptic number.

1283987 is a deficient number, since it is larger than the sum of its proper divisors (16333).

1283987 is an equidigital number, since it uses as much as digits as its factorization.

1283987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16332.

The product of its digits is 24192, while the sum is 38.

The square root of 1283987 is about 1133.1315016361. The cubic root of 1283987 is about 108.6893209738.

The spelling of 1283987 in words is "one million, two hundred eighty-three thousand, nine hundred eighty-seven".