1989609733 has 12 divisors (see below), whose sum is σ = 2114006188. Its totient is φ = 1871876160.

The previous prime is 1989609703. The next prime is 1989609737. The reversal of 1989609733 is 3379069891.

It can be written as a sum of positive squares in 2 ways, for example, as 422795844 + 1566813889 = 20562^2 + 39583^2 .

It is not a de Polignac number, because 1989609733 - 2⁹ = 1989609221 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 (1989609737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1441 + ... + 63097.

Almost surely, 2^1989609733 is an apocalyptic number.

It is an amenable number.

1989609733 is a deficient number, since it is larger than the sum of its proper divisors (124396455).

1989609733 is an equidigital number, since it uses as much as digits as its factorization.

1989609733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61764 (or 61741 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 55.

The square root of 1989609733 is about 44605.0415648276. The cubic root of 1989609733 is about 1257.7354413200.

The spelling of 1989609733 in words is "one billion, nine hundred eighty-nine million, six hundred nine thousand, seven hundred thirty-three".