200001640 has 32 divisors (see below), whose sum is σ = 451451880. Its totient is φ = 79743232.

The previous prime is 200001611. The next prime is 200001673. The reversal of 200001640 is 46100002.

It can be written as a sum of positive squares in 4 ways, for example, as 118243876 + 81757764 = 10874^2 + 9042^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 200001640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4794 + ... + 20566.

Almost surely, 2^200001640 is an apocalyptic number.

200001640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200001640 is an abundant number, since it is smaller than the sum of its proper divisors (251450240).

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

200001640 is a wasteful number, since it uses less digits than its factorization.

200001640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16101 (or 16097 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 200001640 is about 14142.1936063681. The cubic root of 200001640 is about 584.8051461012.

Adding to 200001640 its reverse (46100002), we get a palindrome (246101642).

The spelling of 200001640 in words is "two hundred million, one thousand, six hundred forty".