189843840 has 192 divisors, whose sum is σ = 684534240. Its totient is φ = 48390144.

The previous prime is 189843809. The next prime is 189843911. The reversal of 189843840 is 48348981.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131764 + ... + 133196.

Almost surely, 2^189843840 is an apocalyptic number.

189843840 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 189843840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342267120).

189843840 is an abundant number, since it is smaller than the sum of its proper divisors (494690400).

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

189843840 is a wasteful number, since it uses less digits than its factorization.

189843840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481 (or 1466 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 189843840 is about 13778.3830691413. The cubic root of 189843840 is about 574.7321651170.

The spelling of 189843840 in words is "one hundred eighty-nine million, eight hundred forty-three thousand, eight hundred forty".