1989408073 has 4 divisors (see below), whose sum is σ = 2002079620. Its totient is φ = 1976736528.

The previous prime is 1989408049. The next prime is 1989408131. The reversal of 1989408073 is 3708049891.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 850480569 + 1138927504 = 29163^2 + 33748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989408073 - 2²¹ = 1987310921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989409073) 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, 6335538 + ... + 6335851.

It is an arithmetic number, because the mean of its divisors is an integer number (500519905).

Almost surely, 2^1989408073 is an apocalyptic number.

It is an amenable number.

1989408073 is a deficient number, since it is larger than the sum of its proper divisors (12671547).

1989408073 is a wasteful number, since it uses less digits than its factorization.

1989408073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12671546.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 1989408073 is about 44602.7810007403. The cubic root of 1989408073 is about 1257.6929466380.

The spelling of 1989408073 in words is "one billion, nine hundred eighty-nine million, four hundred eight thousand, seventy-three".