199945684 has 24 divisors (see below), whose sum is σ = 360353448. Its totient is φ = 97013760.

The previous prime is 199945679. The next prime is 199945699. The reversal of 199945684 is 486549991.

It can be written as a sum of positive squares in 4 ways, for example, as 6084 + 199939600 = 78^2 + 14140^2 .

It is a congruent number.

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, 28494 + ... + 34810.

It is an arithmetic number, because the mean of its divisors is an integer number (15014727).

Almost surely, 2^199945684 is an apocalyptic number.

It is an amenable number.

199945684 is a deficient number, since it is larger than the sum of its proper divisors (160407764).

199945684 is a wasteful number, since it uses less digits than its factorization.

199945684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6555 (or 6553 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 55.

The square root of 199945684 is about 14140.2151327340. The cubic root of 199945684 is about 584.7506025335.

The spelling of 199945684 in words is "one hundred ninety-nine million, nine hundred forty-five thousand, six hundred eighty-four".