1989630 has 32 divisors (see below), whose sum is σ = 5306400. Its totient is φ = 530496.

The previous prime is 1989619. The next prime is 1989643. The reversal of 1989630 is 369891.

1989630 is a `hidden beast` number, since 19 + 8 + 9 + 630 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3415 + ... + 3954.

It is an arithmetic number, because the mean of its divisors is an integer number (165825).

2^1989630 is an apocalyptic number.

1989630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1989630 is an abundant number, since it is smaller than the sum of its proper divisors (3316770).

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

1989630 is a wasteful number, since it uses less digits than its factorization.

1989630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7385 (or 7379 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1989630 is about 1410.5424488473. The cubic root of 1989630 is about 125.7739711913.

The spelling of 1989630 in words is "one million, nine hundred eighty-nine thousand, six hundred thirty".