199891456 has 20 divisors (see below), whose sum is σ = 399393522. Its totient is φ = 99945472.

The previous prime is 199891429. The next prime is 199891481. The reversal of 199891456 is 654198991.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 184525056 + 15366400 = 13584^2 + 3920^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194695 + ... + 195718.

Almost surely, 2^199891456 is an apocalyptic number.

199891456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

199891456 is a deficient number, since it is larger than the sum of its proper divisors (199502066).

199891456 is an frugal number, since it uses more digits than its factorization.

199891456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390431 (or 390415 counting only the distinct ones).

The product of its digits is 699840, while the sum is 52.

The square root of 199891456 is about 14138.2974929798. The cubic root of 199891456 is about 584.6977336373.

The spelling of 199891456 in words is "one hundred ninety-nine million, eight hundred ninety-one thousand, four hundred fifty-six".