1283865 has 32 divisors (see below), whose sum is σ = 2322432. Its totient is φ = 600000.

The previous prime is 1283839. The next prime is 1283873. The reversal of 1283865 is 5683821.

It is a happy number.

It is not a de Polignac number, because 1283865 - 2⁹ = 1283353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4990 + ... + 5240.

It is an arithmetic number, because the mean of its divisors is an integer number (72576).

2^1283865 is an apocalyptic number.

1283865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1283865 is a deficient number, since it is larger than the sum of its proper divisors (1038567).

1283865 is a wasteful number, since it uses less digits than its factorization.

1283865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301.

The product of its digits is 11520, while the sum is 33.

The square root of 1283865 is about 1133.0776672409. The cubic root of 1283865 is about 108.6858784371.

It can be divided in two parts, 128 and 3865, that added together give a palindrome (3993).

The spelling of 1283865 in words is "one million, two hundred eighty-three thousand, eight hundred sixty-five".