189243420 has 72 divisors (see below), whose sum is σ = 559301904. Its totient is φ = 47803392.

The previous prime is 189243409. The next prime is 189243427. The reversal of 189243420 is 24342981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189243427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17292 + ... + 26028.

It is an arithmetic number, because the mean of its divisors is an integer number (7768082).

Almost surely, 2^189243420 is an apocalyptic number.

189243420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189243420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279650952).

189243420 is an abundant number, since it is smaller than the sum of its proper divisors (370058484).

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

189243420 is a wasteful number, since it uses less digits than its factorization.

189243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8787 (or 8766 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 189243420 is about 13756.5773359510. The cubic root of 189243420 is about 574.1256225270.

The spelling of 189243420 in words is "one hundred eighty-nine million, two hundred forty-three thousand, four hundred twenty".