1813988 has 12 divisors (see below), whose sum is σ = 3463152. Its totient is φ = 824520.

The previous prime is 1813969. The next prime is 1813991. The reversal of 1813988 is 8893181.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20570 + ... + 20657.

It is an arithmetic number, because the mean of its divisors is an integer number (288596).

2^1813988 is an apocalyptic number.

It is an amenable number.

1813988 is a deficient number, since it is larger than the sum of its proper divisors (1649164).

1813988 is a wasteful number, since it uses less digits than its factorization.

1813988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41242 (or 41240 counting only the distinct ones).

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

The square root of 1813988 is about 1346.8437177342. The cubic root of 1813988 is about 121.9583303002.

The spelling of 1813988 in words is "one million, eight hundred thirteen thousand, nine hundred eighty-eight".