189804820 has 24 divisors (see below), whose sum is σ = 409364424. Its totient is φ = 73869696.

The previous prime is 189804817. The next prime is 189804827. The reversal of 189804820 is 28408981.

It can be written as a sum of positive squares in 4 ways, for example, as 99440784 + 90364036 = 9972^2 + 9506^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189804827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127507 + ... + 128986.

It is an arithmetic number, because the mean of its divisors is an integer number (17056851).

Almost surely, 2^189804820 is an apocalyptic number.

189804820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189804820 is an abundant number, since it is smaller than the sum of its proper divisors (219559604).

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

189804820 is a wasteful number, since it uses less digits than its factorization.

189804820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256539 (or 256537 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 189804820 is about 13776.9670101950. The cubic root of 189804820 is about 574.6927861100.

The spelling of 189804820 in words is "one hundred eighty-nine million, eight hundred four thousand, eight hundred twenty".