1989408 has 96 divisors (see below), whose sum is σ = 5878656. Its totient is φ = 585728.

The previous prime is 1989401. The next prime is 1989413. The reversal of 1989408 is 8049891.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (1989401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37510 + ... + 37562.

It is an arithmetic number, because the mean of its divisors is an integer number (61236).

2^1989408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2939328).

1989408 is an abundant number, since it is smaller than the sum of its proper divisors (3889248).

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

1989408 is a wasteful number, since it uses less digits than its factorization.

1989408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 1989408 is about 1410.4637535222. The cubic root of 1989408 is about 125.7692931255.

The spelling of 1989408 in words is "one million, nine hundred eighty-nine thousand, four hundred eight".