1998788 has 12 divisors (see below), whose sum is σ = 3815952. Its totient is φ = 908520.

The previous prime is 1998761. The next prime is 1998793. The reversal of 1998788 is 8878991.

It is a happy 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, 22670 + ... + 22757.

It is an arithmetic number, because the mean of its divisors is an integer number (317996).

2^1998788 is an apocalyptic number.

It is an amenable number.

1998788 is a deficient number, since it is larger than the sum of its proper divisors (1817164).

1998788 is a wasteful number, since it uses less digits than its factorization.

1998788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45442 (or 45440 counting only the distinct ones).

The product of its digits is 290304, while the sum is 50.

The square root of 1998788 is about 1413.7849907253. The cubic root of 1998788 is about 125.9666494416.

The spelling of 1998788 in words is "one million, nine hundred ninety-eight thousand, seven hundred eighty-eight".