1993218 has 8 divisors (see below), whose sum is σ = 3986448. Its totient is φ = 664404.

The previous prime is 1993217. The next prime is 1993219. The reversal of 1993218 is 8123991.

It is an interprime number because it is at equal distance from previous prime (1993217) and next prime (1993219).

It is a sphenic number, since it is the product of 3 distinct primes.

1993218 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1993217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166096 + ... + 166107.

It is an arithmetic number, because the mean of its divisors is an integer number (498306).

2^1993218 is an apocalyptic number.

1993218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1993218 is a wasteful number, since it uses less digits than its factorization.

1993218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332208.

The product of its digits is 3888, while the sum is 33.

The square root of 1993218 is about 1411.8137270901. The cubic root of 1993218 is about 125.8495306353.

It can be divided in two parts, 1993 and 218, that added together give a triangular number (2211 = T₆₆).

The spelling of 1993218 in words is "one million, nine hundred ninety-three thousand, two hundred eighteen".