1998475 has 6 divisors (see below), whose sum is σ = 2478140. Its totient is φ = 1598760.

The previous prime is 1998473. The next prime is 1998497. The reversal of 1998475 is 5748991.

It is not a de Polignac number, because 1998475 - 2¹ = 1998473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1998473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39945 + ... + 39994.

2^1998475 is an apocalyptic number.

1998475 is a deficient number, since it is larger than the sum of its proper divisors (479665).

1998475 is an equidigital number, since it uses as much as digits as its factorization.

1998475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79949 (or 79944 counting only the distinct ones).

The product of its digits is 90720, while the sum is 43.

The square root of 1998475 is about 1413.6742906342. The cubic root of 1998475 is about 125.9600738535.

The spelling of 1998475 in words is "one million, nine hundred ninety-eight thousand, four hundred seventy-five".