199994644 has 6 divisors (see below), whose sum is σ = 349990634. Its totient is φ = 99997320.

The previous prime is 199994633. The next prime is 199994689. The reversal of 199994644 is 446499991.

It is a happy number.

199994644 is digitally balanced in base 3 and base 9, because in such bases 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., 108409744 + 91584900 = 10412^2 + 9570^2 .

199994644 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999327 + ... + 24999334.

Almost surely, 2^199994644 is an apocalyptic number.

It is an amenable number.

199994644 is a deficient number, since it is larger than the sum of its proper divisors (149995990).

199994644 is a wasteful number, since it uses less digits than its factorization.

199994644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49998665 (or 49998663 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 55.

The square root of 199994644 is about 14141.9462592671. The cubic root of 199994644 is about 584.7983272496.

The spelling of 199994644 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, six hundred forty-four".