201643830 has 48 divisors (see below), whose sum is σ = 543698064. Its totient is φ = 53771040.

The previous prime is 201643823. The next prime is 201643879. The reversal of 201643830 is 38346102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 201643794 and 201643803.

It is a congruent number.

It is an unprimeable number.

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, 39061 + ... + 43920.

It is an arithmetic number, because the mean of its divisors is an integer number (11327043).

Almost surely, 2^201643830 is an apocalyptic number.

201643830 is an abundant number, since it is smaller than the sum of its proper divisors (342054234).

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

201643830 is an equidigital number, since it uses as much as digits as its factorization.

201643830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83003 (or 82991 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 201643830 is about 14200.1348585145. The cubic root of 201643830 is about 586.4013740400.

Adding to 201643830 its reverse (38346102), we get a palindrome (239989932).

The spelling of 201643830 in words is "two hundred one million, six hundred forty-three thousand, eight hundred thirty".