199081438 has 4 divisors (see below), whose sum is σ = 298622160. Its totient is φ = 99540718.

The previous prime is 199081429. The next prime is 199081447. The reversal of 199081438 is 834180991.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (199081429) and next prime (199081447).

It is a super-2 number, since 2×199081438² = 79266837912295688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 199081394 and 199081403.

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, 49770358 + ... + 49770361.

It is an arithmetic number, because the mean of its divisors is an integer number (74655540).

Almost surely, 2^199081438 is an apocalyptic number.

199081438 is a deficient number, since it is larger than the sum of its proper divisors (99540722).

199081438 is an equidigital number, since it uses as much as digits as its factorization.

199081438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99540721.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 199081438 is about 14109.6221777906. The cubic root of 199081438 is about 583.9068762974.

The spelling of 199081438 in words is "one hundred ninety-nine million, eighty-one thousand, four hundred thirty-eight".