199812694 has 4 divisors (see below), whose sum is σ = 299719044. Its totient is φ = 99906346.

The previous prime is 199812677. The next prime is 199812731. The reversal of 199812694 is 496218991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 496218991 = 19 ⋅26116789.

It is a super-2 number, since 2×199812694² = 79850225367075272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 49953172 + ... + 49953175.

It is an arithmetic number, because the mean of its divisors is an integer number (74929761).

Almost surely, 2^199812694 is an apocalyptic number.

199812694 is a deficient number, since it is larger than the sum of its proper divisors (99906350).

199812694 is an equidigital number, since it uses as much as digits as its factorization.

199812694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99906349.

The product of its digits is 279936, while the sum is 49.

The square root of 199812694 is about 14135.5118053787. The cubic root of 199812694 is about 584.6209285991.

The spelling of 199812694 in words is "one hundred ninety-nine million, eight hundred twelve thousand, six hundred ninety-four".