189989440 has 112 divisors (see below), whose sum is σ = 477316800. Its totient is φ = 71923712.

The previous prime is 189989363. The next prime is 189989447. The reversal of 189989440 is 44989981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (189989447) 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, 547347 + ... + 547693.

Almost surely, 2^189989440 is an apocalyptic number.

189989440 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 189989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238658400).

189989440 is an abundant number, since it is smaller than the sum of its proper divisors (287327360).

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

189989440 is a wasteful number, since it uses less digits than its factorization.

189989440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 442 counting only the distinct ones).

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

The square root of 189989440 is about 13783.6656953076. The cubic root of 189989440 is about 574.8790571089.

The spelling of 189989440 in words is "one hundred eighty-nine million, nine hundred eighty-nine thousand, four hundred forty".