200019978 has 24 divisors (see below), whose sum is σ = 433648800. Its totient is φ = 66631464.

The previous prime is 200019949. The next prime is 200019979. The reversal of 200019978 is 879910002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (200019979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42003 + ... + 46521.

It is an arithmetic number, because the mean of its divisors is an integer number (18068700).

Almost surely, 2^200019978 is an apocalyptic number.

200019978 is an abundant number, since it is smaller than the sum of its proper divisors (233628822).

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

200019978 is a wasteful number, since it uses less digits than its factorization.

200019978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6986 (or 6983 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 200019978 is about 14142.8419350568. The cubic root of 200019978 is about 584.8230190030.

The spelling of 200019978 in words is "two hundred million, nineteen thousand, nine hundred seventy-eight".