199994624 has 18 divisors (see below), whose sum is σ = 399208530. Its totient is φ = 99997184.

The previous prime is 199994623. The next prime is 199994629. The reversal of 199994624 is 426499991.

It is a happy number.

199994624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 196897024 + 3097600 = 14032^2 + 1760^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199994623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390359 + ... + 390870.

Almost surely, 2^199994624 is an apocalyptic number.

It is an amenable number.

199994624 is a deficient number, since it is larger than the sum of its proper divisors (199213906).

199994624 is an frugal number, since it uses more digits than its factorization.

199994624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781245 (or 781231 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 53.

The square root of 199994624 is about 14141.9455521509. The cubic root of 199994624 is about 584.7983077558.

The spelling of 199994624 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, six hundred twenty-four".