1998815 has 32 divisors (see below), whose sum is σ = 3096576. Its totient is φ = 1203840.

The previous prime is 1998793. The next prime is 1998817. The reversal of 1998815 is 5188991.

It is not a de Polignac number, because 1998815 - 2⁸ = 1998559 is a prime.

It is a super-2 number, since 2×1998815² = 7990522808450, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 10370 + ... + 10560.

It is an arithmetic number, because the mean of its divisors is an integer number (96768).

2^1998815 is an apocalyptic number.

1998815 is a deficient number, since it is larger than the sum of its proper divisors (1097761).

1998815 is a wasteful number, since it uses less digits than its factorization.

1998815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239.

The product of its digits is 25920, while the sum is 41.

The square root of 1998815 is about 1413.7945395283. The cubic root of 1998815 is about 125.9672166327.

The spelling of 1998815 in words is "one million, nine hundred ninety-eight thousand, eight hundred fifteen".