199393945 has 8 divisors (see below), whose sum is σ = 240408000. Its totient is φ = 158758320.

The previous prime is 199393919. The next prime is 199393949. The reversal of 199393945 is 549393991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 199393945 - 2²³ = 191005337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199393892 and 199393901.

It is not an unprimeable number, because it can be changed into a prime (199393949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93445 + ... + 95554.

It is an arithmetic number, because the mean of its divisors is an integer number (30051000).

Almost surely, 2^199393945 is an apocalyptic number.

It is an amenable number.

199393945 is a deficient number, since it is larger than the sum of its proper divisors (41014055).

199393945 is a wasteful number, since it uses less digits than its factorization.

199393945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189215.

The product of its digits is 1180980, while the sum is 52.

The square root of 199393945 is about 14120.6920864383. The cubic root of 199393945 is about 584.2122447796.

The spelling of 199393945 in words is "one hundred ninety-nine million, three hundred ninety-three thousand, nine hundred forty-five".