189474978 has 32 divisors (see below), whose sum is σ = 472458240. Its totient is φ = 49214160.

The previous prime is 189474959. The next prime is 189474991. The reversal of 189474978 is 879474981.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204598 + ... + 205521.

It is an arithmetic number, because the mean of its divisors is an integer number (14764320).

Almost surely, 2^189474978 is an apocalyptic number.

189474978 is an abundant number, since it is smaller than the sum of its proper divisors (282983262).

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

189474978 is a wasteful number, since it uses less digits than its factorization.

189474978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410142.

The product of its digits is 4064256, while the sum is 57.

The square root of 189474978 is about 13764.9910279666. The cubic root of 189474978 is about 574.3596935357.

The spelling of 189474978 in words is "one hundred eighty-nine million, four hundred seventy-four thousand, nine hundred seventy-eight".