189778602 has 16 divisors (see below), whose sum is σ = 408754080. Its totient is φ = 58393392.

The previous prime is 189778601. The next prime is 189778643. The reversal of 189778602 is 206877981.

It is not an unprimeable number, because it can be changed into a prime (189778601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1216452 + ... + 1216607.

It is an arithmetic number, because the mean of its divisors is an integer number (25547130).

Almost surely, 2^189778602 is an apocalyptic number.

189778602 is an abundant number, since it is smaller than the sum of its proper divisors (218975478).

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

189778602 is a wasteful number, since it uses less digits than its factorization.

189778602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433077.

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 189778602 is about 13776.0154616638. The cubic root of 189778602 is about 574.6663238574. Note that the first 3 decimals are identical.

The spelling of 189778602 in words is "one hundred eighty-nine million, seven hundred seventy-eight thousand, six hundred two".