189430729 has 8 divisors (see below), whose sum is σ = 191177280. Its totient is φ = 187689936.

The previous prime is 189430721. The next prime is 189430753. The reversal of 189430729 is 927034981.

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

It is a cyclic number.

It is not a de Polignac number, because 189430729 - 2³ = 189430721 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189430721) 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, 89724 + ... + 91810.

It is an arithmetic number, because the mean of its divisors is an integer number (23897160).

Almost surely, 2^189430729 is an apocalyptic number.

It is an amenable number.

189430729 is a deficient number, since it is larger than the sum of its proper divisors (1746551).

189430729 is a wasteful number, since it uses less digits than its factorization.

189430729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2879.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 189430729 is about 13763.3836319417. The cubic root of 189430729 is about 574.3149790637.

It can be divided in two parts, 1894 and 30729, that added together give a palindrome (32623).

The spelling of 189430729 in words is "one hundred eighty-nine million, four hundred thirty thousand, seven hundred twenty-nine".