18231798 has 32 divisors (see below), whose sum is σ = 40233312. Its totient is φ = 5472000.

The previous prime is 18231793. The next prime is 18231799. The reversal of 18231798 is 89713281.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18231791) 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 15 ways as a sum of consecutive naturals, for example, 348 + ... + 6048.

It is an arithmetic number, because the mean of its divisors is an integer number (1257291).

Almost surely, 2^18231798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18231798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20116656).

18231798 is an abundant number, since it is smaller than the sum of its proper divisors (22001514).

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

18231798 is a wasteful number, since it uses less digits than its factorization.

18231798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5760.

The product of its digits is 24192, while the sum is 39.

The square root of 18231798 is about 4269.8709582375. The cubic root of 18231798 is about 263.1943124912.

The spelling of 18231798 in words is "eighteen million, two hundred thirty-one thousand, seven hundred ninety-eight".