189434421 has 24 divisors (see below), whose sum is σ = 300703104. Its totient is φ = 113962560.

The previous prime is 189434387. The next prime is 189434437. The reversal of 189434421 is 124434981.

It is a happy number.

189434421 is a `hidden beast` number, since 189 + 434 + 42 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-189434421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189434821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6580 + ... + 20546.

It is an arithmetic number, because the mean of its divisors is an integer number (12529296).

Almost surely, 2^189434421 is an apocalyptic number.

189434421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189434421 is a deficient number, since it is larger than the sum of its proper divisors (111268683).

189434421 is a wasteful number, since it uses less digits than its factorization.

189434421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14121 (or 14118 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 189434421 is about 13763.5177552833. The cubic root of 189434421 is about 574.3187101675.

It can be divided in two parts, 1894 and 34421, that added together give a triangular number (36315 = T₂₆₉).

The spelling of 189434421 in words is "one hundred eighty-nine million, four hundred thirty-four thousand, four hundred twenty-one".