1998549 has 12 divisors (see below), whose sum is σ = 3299296. Its totient is φ = 1141992.

The previous prime is 1998541. The next prime is 1998559. The reversal of 1998549 is 9458991.

1998549 is a `hidden beast` number, since 19 + 98 + 549 = 666.

It is not a de Polignac number, because 1998549 - 2³ = 1998541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998541) 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, 15799 + ... + 15924.

2^1998549 is an apocalyptic number.

It is an amenable number.

1998549 is a deficient number, since it is larger than the sum of its proper divisors (1300747).

1998549 is a wasteful number, since it uses less digits than its factorization.

1998549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31736 (or 31733 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 1998549 is about 1413.7004633231. The cubic root of 1998549 is about 125.9616285274.

The spelling of 1998549 in words is "one million, nine hundred ninety-eight thousand, five hundred forty-nine".