199729994 has 4 divisors (see below), whose sum is σ = 299594994. Its totient is φ = 99864996.

The previous prime is 199729967. The next prime is 199730021. The reversal of 199729994 is 499927991.

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 (199729967) and next prime (199730021).

It can be written as a sum of positive squares in only one way, i.e., 199515625 + 214369 = 14125^2 + 463^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49932497 + ... + 49932500.

Almost surely, 2^199729994 is an apocalyptic number.

199729994 is a deficient number, since it is larger than the sum of its proper divisors (99865000).

199729994 is an equidigital number, since it uses as much as digits as its factorization.

199729994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99864999.

The product of its digits is 3306744, while the sum is 59.

The square root of 199729994 is about 14132.5862459778. The cubic root of 199729994 is about 584.5402616812.

The spelling of 199729994 in words is "one hundred ninety-nine million, seven hundred twenty-nine thousand, nine hundred ninety-four".