199779036 has 48 divisors (see below), whose sum is σ = 496419840. Its totient is φ = 62314240.

The previous prime is 199779007. The next prime is 199779049. The reversal of 199779036 is 630977991.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 199779036.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33781 + ... + 39251.

It is an arithmetic number, because the mean of its divisors is an integer number (10342080).

Almost surely, 2^199779036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199779036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248209920).

199779036 is an abundant number, since it is smaller than the sum of its proper divisors (296640804).

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

199779036 is a wasteful number, since it uses less digits than its factorization.

199779036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5674 (or 5672 counting only the distinct ones).

The product of its (nonzero) digits is 642978, while the sum is 51.

The square root of 199779036 is about 14134.3212076138. The cubic root of 199779036 is about 584.5881007279.

The spelling of 199779036 in words is "one hundred ninety-nine million, seven hundred seventy-nine thousand, thirty-six".