189142578 has 48 divisors (see below), whose sum is σ = 441072216. Its totient is φ = 58360320.

The previous prime is 189142573. The next prime is 189142589. The reversal of 189142578 is 875241981.

It can be written as a sum of positive squares in 4 ways, for example, as 162486009 + 26656569 = 12747^2 + 5163^2 .

It is not an unprimeable number, because it can be changed into a prime (189142571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13600 + ... + 23732.

Almost surely, 2^189142578 is an apocalyptic number.

189142578 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 189142578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220536108).

189142578 is an abundant number, since it is smaller than the sum of its proper divisors (251929638).

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

189142578 is a wasteful number, since it uses less digits than its factorization.

189142578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10219 (or 10216 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 189142578 is about 13752.9116189991. The cubic root of 189142578 is about 574.0236264440.

The spelling of 189142578 in words is "one hundred eighty-nine million, one hundred forty-two thousand, five hundred seventy-eight".