199791424 has 42 divisors (see below), whose sum is σ = 461196690. Its totient is φ = 85623552.

The previous prime is 199791421. The next prime is 199791439. The reversal of 199791424 is 424197991.

It can be written as a sum of positive squares in only one way, i.e., 129231424 + 70560000 = 11368^2 + 8400^2 .

It is a super-2 number, since 2×199791424² = 79833226207895552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199791421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28719 + ... + 34990.

Almost surely, 2^199791424 is an apocalyptic number.

199791424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

199791424 is an abundant number, since it is smaller than the sum of its proper divisors (261405266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199791424 is an equidigital number, since it uses as much as digits as its factorization.

199791424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63735 (or 63718 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The square root of 199791424 is about 14134.7594249071. The cubic root of 199791424 is about 584.6001836235.

The spelling of 199791424 in words is "one hundred ninety-nine million, seven hundred ninety-one thousand, four hundred twenty-four".