189878946 has 16 divisors (see below), whose sum is σ = 380974944. Its totient is φ = 63090144.

The previous prime is 189878939. The next prime is 189878959. The reversal of 189878946 is 649878981.

It is a self number, because there is not a number n which added to its sum of digits gives 189878946.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48676 + ... + 52431.

It is an arithmetic number, because the mean of its divisors is an integer number (23810934).

Almost surely, 2^189878946 is an apocalyptic number.

189878946 is an abundant number, since it is smaller than the sum of its proper divisors (191095998).

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

189878946 is a wasteful number, since it uses less digits than its factorization.

189878946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101425.

The product of its digits is 6967296, while the sum is 60.

The square root of 189878946 is about 13779.6569623485. The cubic root of 189878946 is about 574.7675895020.

The spelling of 189878946 in words is "one hundred eighty-nine million, eight hundred seventy-eight thousand, nine hundred forty-six".