189361640 has 128 divisors (see below), whose sum is σ = 502225920. Its totient is φ = 63590400.

The previous prime is 189361559. The next prime is 189361681. The reversal of 189361640 is 46163981.

It is a junction number, because it is equal to n+sod(n) for n = 189361594 and 189361603.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273695 + ... + 274385.

It is an arithmetic number, because the mean of its divisors is an integer number (3923640).

Almost surely, 2^189361640 is an apocalyptic number.

189361640 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 189361640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251112960).

189361640 is an abundant number, since it is smaller than the sum of its proper divisors (312864280).

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

189361640 is a wasteful number, since it uses less digits than its factorization.

189361640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763 (or 759 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 189361640 is about 13760.8735187851. The cubic root of 189361640 is about 574.2451493646.

The spelling of 189361640 in words is "one hundred eighty-nine million, three hundred sixty-one thousand, six hundred forty".