1998975 has 24 divisors (see below), whose sum is σ = 3606912. Its totient is φ = 968800.

The previous prime is 1998961. The next prime is 1998977. The reversal of 1998975 is 5798991.

It is not a de Polignac number, because 1998975 - 2⁵ = 1998943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 387 + ... + 2036.

It is an arithmetic number, because the mean of its divisors is an integer number (150288).

2^1998975 is an apocalyptic number.

1998975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1998975 is a deficient number, since it is larger than the sum of its proper divisors (1607937).

1998975 is a wasteful number, since it uses less digits than its factorization.

1998975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447 (or 2442 counting only the distinct ones).

The product of its digits is 204120, while the sum is 48.

The square root of 1998975 is about 1413.8511237043. The cubic root of 1998975 is about 125.9705776602.

The spelling of 1998975 in words is "one million, nine hundred ninety-eight thousand, nine hundred seventy-five".