198929823 has 4 divisors (see below), whose sum is σ = 265239768. Its totient is φ = 132619880.

The previous prime is 198929807. The next prime is 198929837. The reversal of 198929823 is 328929891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328929891 = 3 ⋅109643297.

It is a cyclic number.

It is not a de Polignac number, because 198929823 - 2⁴ = 198929807 is a prime.

It is a super-2 number, since 2×198929823² = 79146148957622658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198929893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33154968 + ... + 33154973.

It is an arithmetic number, because the mean of its divisors is an integer number (66309942).

Almost surely, 2^198929823 is an apocalyptic number.

198929823 is a deficient number, since it is larger than the sum of its proper divisors (66309945).

198929823 is an equidigital number, since it uses as much as digits as its factorization.

198929823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66309944.

The product of its digits is 559872, while the sum is 51.

The square root of 198929823 is about 14104.2484025204. The cubic root of 198929823 is about 583.7586094621.

The spelling of 198929823 in words is "one hundred ninety-eight million, nine hundred twenty-nine thousand, eight hundred twenty-three".