199722945 has 8 divisors (see below), whose sum is σ = 319556736. Its totient is φ = 106518896.

The previous prime is 199722937. The next prime is 199722949. The reversal of 199722945 is 549227991.

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

It is a cyclic number.

It is not a de Polignac number, because 199722945 - 2³ = 199722937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199722894 and 199722903.

It is not an unprimeable number, because it can be changed into a prime (199722949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6657417 + ... + 6657446.

It is an arithmetic number, because the mean of its divisors is an integer number (39944592).

Almost surely, 2^199722945 is an apocalyptic number.

199722945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199722945 is a deficient number, since it is larger than the sum of its proper divisors (119833791).

199722945 is a wasteful number, since it uses less digits than its factorization.

199722945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13314871.

The product of its digits is 408240, while the sum is 48.

The square root of 199722945 is about 14132.3368555947. The cubic root of 199722945 is about 584.5333849428.

It can be divided in two parts, 1997 and 22945, that added together give a palindrome (24942).

The spelling of 199722945 in words is "one hundred ninety-nine million, seven hundred twenty-two thousand, nine hundred forty-five".