189899440 has 80 divisors (see below), whose sum is σ = 455328000. Its totient is φ = 73624320.

The previous prime is 189899407. The next prime is 189899447. The reversal of 189899440 is 44998981.

It is a happy number.

189899440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (189899447) 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, 380311 + ... + 380809.

It is an arithmetic number, because the mean of its divisors is an integer number (5691600).

Almost surely, 2^189899440 is an apocalyptic number.

189899440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189899440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227664000).

189899440 is an abundant number, since it is smaller than the sum of its proper divisors (265428560).

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

189899440 is a wasteful number, since it uses less digits than its factorization.

189899440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 189899440 is about 13780.4005747293. The cubic root of 189899440 is about 574.7882673487.

The spelling of 189899440 in words is "one hundred eighty-nine million, eight hundred ninety-nine thousand, four hundred forty".