1298778 has 16 divisors (see below), whose sum is σ = 2797536. Its totient is φ = 399600.

The previous prime is 1298771. The next prime is 1298779. The reversal of 1298778 is 8778921.

It is not an unprimeable number, because it can be changed into a prime (1298771) by changing a digit.

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, 8248 + ... + 8403.

It is an arithmetic number, because the mean of its divisors is an integer number (174846).

2^1298778 is an apocalyptic number.

1298778 is an abundant number, since it is smaller than the sum of its proper divisors (1498758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1298778 is a wasteful number, since it uses less digits than its factorization.

1298778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16669.

The product of its digits is 56448, while the sum is 42.

The square root of 1298778 is about 1139.6394166577. The cubic root of 1298778 is about 109.1050806085.

It can be divided in two parts, 12 and 98778, that added together give a triangular number (98790 = T₄₄₄).

The spelling of 1298778 in words is "one million, two hundred ninety-eight thousand, seven hundred seventy-eight".