1813398 has 16 divisors (see below), whose sum is σ = 3817920. Its totient is φ = 572616.

The previous prime is 1813391. The next prime is 1813421. The reversal of 1813398 is 8933181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7840 + ... + 8067.

It is an arithmetic number, because the mean of its divisors is an integer number (238620).

2^1813398 is an apocalyptic number.

1813398 is an abundant number, since it is smaller than the sum of its proper divisors (2004522).

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

1813398 is a wasteful number, since it uses less digits than its factorization.

1813398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15931.

The product of its digits is 5184, while the sum is 33.

The square root of 1813398 is about 1346.6246693121. The cubic root of 1813398 is about 121.9451065417.

It can be divided in two parts, 1813 and 398, that added together give a triangular number (2211 = T₆₆).

The spelling of 1813398 in words is "one million, eight hundred thirteen thousand, three hundred ninety-eight".