1998430 has 16 divisors (see below), whose sum is σ = 4111200. Its totient is φ = 685152.

The previous prime is 1998427. The next prime is 1998431. The reversal of 1998430 is 348991.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14205 + ... + 14344.

It is an arithmetic number, because the mean of its divisors is an integer number (256950).

2^1998430 is an apocalyptic number.

1998430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998430 is an abundant number, since it is smaller than the sum of its proper divisors (2112770).

1998430 is a wasteful number, since it uses less digits than its factorization.

1998430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28563.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1998430 is about 1413.6583745729. The cubic root of 1998430 is about 125.9591284250.

The spelling of 1998430 in words is "one million, nine hundred ninety-eight thousand, four hundred thirty".