1988018 has 6 divisors (see below), whose sum is σ = 2985021. Its totient is φ = 993012.

The previous prime is 1988011. The next prime is 1988023. The reversal of 1988018 is 8108891.

It can be written as a sum of positive squares in 2 ways, for example, as 1682209 + 305809 = 1297^2 + 553^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=997.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988011) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1496 + ... + 2492.

2^1988018 is an apocalyptic number.

1988018 is a deficient number, since it is larger than the sum of its proper divisors (997003).

1988018 is an frugal number, since it uses more digits than its factorization.

1988018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996 (or 999 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1988018 is about 1409.9709216860. The cubic root of 1988018 is about 125.7399946191.

Multiplying 1988018 by its product of nonzero digits (4608), we get a square (9160786944 = 95712²).

The spelling of 1988018 in words is "one million, nine hundred eighty-eight thousand, eighteen".