199621443 has 12 divisors (see below), whose sum is σ = 309617160. Its totient is φ = 114069312.

The previous prime is 199621423. The next prime is 199621453. The reversal of 199621443 is 344126991.

It is not a de Polignac number, because 199621443 - 2⁶ = 199621379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199621423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 678838 + ... + 679131.

It is an arithmetic number, because the mean of its divisors is an integer number (25801430).

Almost surely, 2^199621443 is an apocalyptic number.

199621443 is a deficient number, since it is larger than the sum of its proper divisors (109995717).

199621443 is a wasteful number, since it uses less digits than its factorization.

199621443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357986 (or 1357979 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 199621443 is about 14128.7452733780. The cubic root of 199621443 is about 584.4343454768.

The spelling of 199621443 in words is "one hundred ninety-nine million, six hundred twenty-one thousand, four hundred forty-three".