1989599 has 4 divisors (see below), whose sum is σ = 2009400. Its totient is φ = 1969800.

The previous prime is 1989583. The next prime is 1989613. The reversal of 1989599 is 9959891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9959891 = 811 ⋅12281.

It is a cyclic number.

It is not a de Polignac number, because 1989599 - 2⁴ = 1989583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9749 + ... + 9950.

It is an arithmetic number, because the mean of its divisors is an integer number (502350).

2^1989599 is an apocalyptic number.

1989599 is a deficient number, since it is larger than the sum of its proper divisors (19801).

1989599 is a wasteful number, since it uses less digits than its factorization.

1989599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19800.

The product of its digits is 262440, while the sum is 50.

The square root of 1989599 is about 1410.5314601242. The cubic root of 1989599 is about 125.7733179687.

The spelling of 1989599 in words is "one million, nine hundred eighty-nine thousand, five hundred ninety-nine".