1998456 has 16 divisors (see below), whose sum is σ = 4996200. Its totient is φ = 666144.

The previous prime is 1998449. The next prime is 1998457. The reversal of 1998456 is 6548991.

It is a zygodrome in base 2 and base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41611 + ... + 41658.

2^1998456 is an apocalyptic number.

It is an amenable number.

1998456 is an abundant number, since it is smaller than the sum of its proper divisors (2997744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1998456 is a wasteful number, since it uses less digits than its factorization.

1998456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83278 (or 83274 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 1998456 is about 1413.6675705412. The cubic root of 1998456 is about 125.9596746743.

The spelling of 1998456 in words is "one million, nine hundred ninety-eight thousand, four hundred fifty-six".