189729381 has 16 divisors (see below), whose sum is σ = 256443264. Its totient is φ = 124760064.

The previous prime is 189729361. The next prime is 189729403. The reversal of 189729381 is 183927981.

189729381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189729381 - 2⁵ = 189729349 is a prime.

It is a super-2 number, since 2×189729381² = 71994476029286322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 189729381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189729341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101800 + ... + 103646.

It is an arithmetic number, because the mean of its divisors is an integer number (16027704).

Almost surely, 2^189729381 is an apocalyptic number.

It is an amenable number.

189729381 is a deficient number, since it is larger than the sum of its proper divisors (66713883).

189729381 is a wasteful number, since it uses less digits than its factorization.

189729381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300.

The product of its digits is 217728, while the sum is 48.

The square root of 189729381 is about 13774.2288713380. The cubic root of 189729381 is about 574.6166377204.

The spelling of 189729381 in words is "one hundred eighty-nine million, seven hundred twenty-nine thousand, three hundred eighty-one".