1398818 has 16 divisors (see below), whose sum is σ = 2233440. Its totient is φ = 655200.

The previous prime is 1398781. The next prime is 1398841. The reversal of 1398818 is 8188931.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4838 + ... + 5118.

It is an arithmetic number, because the mean of its divisors is an integer number (139590).

2^1398818 is an apocalyptic number.

1398818 is a deficient number, since it is larger than the sum of its proper divisors (834622).

1398818 is a wasteful number, since it uses less digits than its factorization.

1398818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433.

The product of its digits is 13824, while the sum is 38.

The square root of 1398818 is about 1182.7163649836. The cubic root of 1398818 is about 111.8374022407.

The spelling of 1398818 in words is "one million, three hundred ninety-eight thousand, eight hundred eighteen".