1989530 has 8 divisors (see below), whose sum is σ = 3581172. Its totient is φ = 795808.

The previous prime is 1989517. The next prime is 1989551. The reversal of 1989530 is 359891.

It can be written as a sum of positive squares in 2 ways, for example, as 1907161 + 82369 = 1381^2 + 287^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99467 + ... + 99486.

2^1989530 is an apocalyptic number.

1989530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989530 is a deficient number, since it is larger than the sum of its proper divisors (1591642).

1989530 is a wasteful number, since it uses less digits than its factorization.

1989530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198960.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1989530 is about 1410.5070010461. The cubic root of 1989530 is about 125.7718639975.

The spelling of 1989530 in words is "one million, nine hundred eighty-nine thousand, five hundred thirty".