189381078 has 64 divisors (see below), whose sum is σ = 441028800. Its totient is φ = 60909408.

The previous prime is 189381047. The next prime is 189381079. The reversal of 189381078 is 870183981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189381079) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126100 + ... + 127592.

It is an arithmetic number, because the mean of its divisors is an integer number (6891075).

Almost surely, 2^189381078 is an apocalyptic number.

189381078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 189381078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220514400).

189381078 is an abundant number, since it is smaller than the sum of its proper divisors (251647722).

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

189381078 is an equidigital number, since it uses as much as digits as its factorization.

189381078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1527 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 189381078 is about 13761.5797784993. The cubic root of 189381078 is about 574.2647974751.

The spelling of 189381078 in words is "one hundred eighty-nine million, three hundred eighty-one thousand, seventy-eight".