189343640 has 16 divisors (see below), whose sum is σ = 426023280. Its totient is φ = 75737440.

The previous prime is 189343633. The next prime is 189343643. The reversal of 189343640 is 46343981.

It is a junction number, because it is equal to n+sod(n) for n = 189343594 and 189343603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189343643) 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 3 ways as a sum of consecutive naturals, for example, 2366756 + ... + 2366835.

It is an arithmetic number, because the mean of its divisors is an integer number (26626455).

Almost surely, 2^189343640 is an apocalyptic number.

189343640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189343640 is an abundant number, since it is smaller than the sum of its proper divisors (236679640).

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

189343640 is a wasteful number, since it uses less digits than its factorization.

189343640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733602 (or 4733598 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 189343640 is about 13760.2194749938. The cubic root of 189343640 is about 574.2269535987.

The spelling of 189343640 in words is "one hundred eighty-nine million, three hundred forty-three thousand, six hundred forty".