189278838 has 48 divisors (see below), whose sum is σ = 469886976. Its totient is φ = 53941680.

The previous prime is 189278821. The next prime is 189278851. The reversal of 189278838 is 838872981.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54123 + ... + 57513.

It is an arithmetic number, because the mean of its divisors is an integer number (9789312).

Almost surely, 2^189278838 is an apocalyptic number.

189278838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

189278838 is an abundant number, since it is smaller than the sum of its proper divisors (280608138).

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

189278838 is a wasteful number, since it uses less digits than its factorization.

189278838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849 (or 3846 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The square root of 189278838 is about 13757.8645872097. The cubic root of 189278838 is about 574.1614372691.

The spelling of 189278838 in words is "one hundred eighty-nine million, two hundred seventy-eight thousand, eight hundred thirty-eight".