189429778 has 8 divisors (see below), whose sum is σ = 293310720. Its totient is φ = 91659540.

The previous prime is 189429761. The next prime is 189429797. The reversal of 189429778 is 877924981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1527598 + ... + 1527721.

It is an arithmetic number, because the mean of its divisors is an integer number (36663840).

Almost surely, 2^189429778 is an apocalyptic number.

189429778 is a deficient number, since it is larger than the sum of its proper divisors (103880942).

189429778 is a wasteful number, since it uses less digits than its factorization.

189429778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055352.

The product of its digits is 2032128, while the sum is 55.

The square root of 189429778 is about 13763.3490837078. The cubic root of 189429778 is about 574.3140179834.

The spelling of 189429778 in words is "one hundred eighty-nine million, four hundred twenty-nine thousand, seven hundred seventy-eight".