189000078 has 32 divisors (see below), whose sum is σ = 389545632. Its totient is φ = 61094400.

The previous prime is 189000073. The next prime is 189000103. The reversal of 189000078 is 870000981.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189000073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40338 + ... + 44778.

It is an arithmetic number, because the mean of its divisors is an integer number (12173301).

Almost surely, 2^189000078 is an apocalyptic number.

189000078 is an abundant number, since it is smaller than the sum of its proper divisors (200545554).

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

189000078 is a wasteful number, since it uses less digits than its factorization.

189000078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4660.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 189000078 is about 13747.7299216998. The cubic root of 189000078 is about 573.8794337781.

The spelling of 189000078 in words is "one hundred eighty-nine million, seventy-eight", and thus it is an aban number.