1981318 has 8 divisors (see below), whose sum is σ = 3005640. Its totient is φ = 979440.

The previous prime is 1981297. The next prime is 1981337. The reversal of 1981318 is 8131891.

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

It is a super-3 number, since 3×1981318³ = 23333710747218268296, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1981318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5388 + ... + 5743.

It is an arithmetic number, because the mean of its divisors is an integer number (375705).

2^1981318 is an apocalyptic number.

1981318 is a deficient number, since it is larger than the sum of its proper divisors (1024322).

1981318 is a wasteful number, since it uses less digits than its factorization.

1981318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11222.

The product of its digits is 1728, while the sum is 31.

The square root of 1981318 is about 1407.5929809430. The cubic root of 1981318 is about 125.5985797100.

The spelling of 1981318 in words is "one million, nine hundred eighty-one thousand, three hundred eighteen".