189406984 has 64 divisors (see below), whose sum is σ = 392999040. Its totient is φ = 85048320.

The previous prime is 189406969. The next prime is 189406999. The reversal of 189406984 is 489604981.

It is an interprime number because it is at equal distance from previous prime (189406969) and next prime (189406999).

Together with 203592056 it forms an amicable pair .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 834279 + ... + 834505.

It is an arithmetic number, because the mean of its divisors is an integer number (6140610).

Almost surely, 2^189406984 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 189406984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196499520).

189406984 is an abundant number, since it is smaller than the sum of its proper divisors (203592056).

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

189406984 is a wasteful number, since it uses less digits than its factorization.

189406984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 189406984 is about 13762.5209899931. The cubic root of 189406984 is about 574.2909814102.

The spelling of 189406984 in words is "one hundred eighty-nine million, four hundred six thousand, nine hundred eighty-four".