1989920 has 24 divisors (see below), whose sum is σ = 4701564. Its totient is φ = 795904.

The previous prime is 1989919. The next prime is 1989947. The reversal of 1989920 is 299891.

It can be written as a sum of positive squares in 2 ways, for example, as 1731856 + 258064 = 1316^2 + 508^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6059 + ... + 6378.

2^1989920 is an apocalyptic number.

1989920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1989920 is an abundant number, since it is smaller than the sum of its proper divisors (2711644).

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

1989920 is a wasteful number, since it uses less digits than its factorization.

1989920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12452 (or 12444 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 1989920 is about 1410.6452424334. The cubic root of 1989920 is about 125.7800816539.

The spelling of 1989920 in words is "one million, nine hundred eighty-nine thousand, nine hundred twenty".