199193638 has 16 divisors (see below), whose sum is σ = 341961984. Its totient is φ = 85246920.

The previous prime is 199193633. The next prime is 199193651. The reversal of 199193638 is 836391991.

It is a junction number, because it is equal to n+sod(n) for n = 199193591 and 199193600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199193633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393 + ... + 19963.

It is an arithmetic number, because the mean of its divisors is an integer number (21372624).

Almost surely, 2^199193638 is an apocalyptic number.

199193638 is a deficient number, since it is larger than the sum of its proper divisors (142768346).

199193638 is a wasteful number, since it uses less digits than its factorization.

199193638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20307.

The product of its digits is 314928, while the sum is 49.

The square root of 199193638 is about 14113.5976278198. The cubic root of 199193638 is about 584.0165500877.

The spelling of 199193638 in words is "one hundred ninety-nine million, one hundred ninety-three thousand, six hundred thirty-eight".