200138868 has 18 divisors (see below), whose sum is σ = 505906674. Its totient is φ = 66712944.

The previous prime is 200138867. The next prime is 200138881. The reversal of 200138868 is 868831002.

It can be written as a sum of positive squares in only one way, i.e., 184362084 + 15776784 = 13578^2 + 3972^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5559413 = 200138868 / (2 + 0 + 0 + 1 + 3 + 8 + 8 + 6 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200138867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2779671 + ... + 2779742.

Almost surely, 2^200138868 is an apocalyptic number.

It is an amenable number.

200138868 is an abundant number, since it is smaller than the sum of its proper divisors (305767806).

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

200138868 is a wasteful number, since it uses less digits than its factorization.

200138868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5559423 (or 5559418 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 200138868 is about 14147.0444969965. The cubic root of 200138868 is about 584.9388671599.

The spelling of 200138868 in words is "two hundred million, one hundred thirty-eight thousand, eight hundred sixty-eight".