1989830 has 16 divisors (see below), whose sum is σ = 3603744. Its totient is φ = 791040.

The previous prime is 1989811. The next prime is 1989847. The reversal of 1989830 is 389891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1415 + ... + 2445.

It is an arithmetic number, because the mean of its divisors is an integer number (225234).

2^1989830 is an apocalyptic number.

1989830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989830 is a deficient number, since it is larger than the sum of its proper divisors (1613914).

1989830 is a wasteful number, since it uses less digits than its factorization.

1989830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1989830 is about 1410.6133417773. The cubic root of 1989830 is about 125.7781853670.

The spelling of 1989830 in words is "one million, nine hundred eighty-nine thousand, eight hundred thirty".