1998819 has 12 divisors (see below), whose sum is σ = 3039400. Its totient is φ = 1262304.

The previous prime is 1998817. The next prime is 1998827. The reversal of 1998819 is 9188991.

It is not a de Polignac number, because 1998819 - 2¹ = 1998817 is a prime.

It is a super-2 number, since 2×1998819² = 7990554789522, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5674 + ... + 6015.

2^1998819 is an apocalyptic number.

1998819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1998819 is a deficient number, since it is larger than the sum of its proper divisors (1040581).

1998819 is a wasteful number, since it uses less digits than its factorization.

1998819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11714 (or 11711 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 1998819 is about 1413.7959541603. The cubic root of 1998819 is about 125.9673006605.

The spelling of 1998819 in words is "one million, nine hundred ninety-eight thousand, eight hundred nineteen".