189247878 has 12 divisors (see below), whose sum is σ = 410037108. Its totient is φ = 63082620.

The previous prime is 189247867. The next prime is 189247879. The reversal of 189247878 is 878742981.

It is a happy number.

189247878 is a `hidden beast` number, since 18 + 92 + 478 + 78 = 666.

189247878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×189247878³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189247879) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5256868 + ... + 5256903.

It is an arithmetic number, because the mean of its divisors is an integer number (34169759).

Almost surely, 2^189247878 is an apocalyptic number.

189247878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

189247878 is an abundant number, since it is smaller than the sum of its proper divisors (220789230).

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

189247878 is a wasteful number, since it uses less digits than its factorization.

189247878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10513779 (or 10513776 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The square root of 189247878 is about 13756.7393665796. The cubic root of 189247878 is about 574.1301307100.

It can be divided in two parts, 1892 and 47878, that added together give a triangular number (49770 = T₃₁₅).

The spelling of 189247878 in words is "one hundred eighty-nine million, two hundred forty-seven thousand, eight hundred seventy-eight".