1284878 has 16 divisors (see below), whose sum is σ = 2248800. Its totient is φ = 550368.

The previous prime is 1284863. The next prime is 1284889. The reversal of 1284878 is 8784821.

It is a happy number.

It is a super-2 number, since 2×1284878² = 3301822949768, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 251 + ... + 1622.

It is an arithmetic number, because the mean of its divisors is an integer number (140550).

2^1284878 is an apocalyptic number.

1284878 is a deficient number, since it is larger than the sum of its proper divisors (963922).

1284878 is an equidigital number, since it uses as much as digits as its factorization.

1284878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896 (or 1882 counting only the distinct ones).

The product of its digits is 28672, while the sum is 38.

The square root of 1284878 is about 1133.5245917050. The cubic root of 1284878 is about 108.7144561694.

The spelling of 1284878 in words is "one million, two hundred eighty-four thousand, eight hundred seventy-eight".