198640323 has 16 divisors (see below), whose sum is σ = 336322560. Its totient is φ = 113508648.

The previous prime is 198640303. The next prime is 198640357. The reversal of 198640323 is 323046891.

198640323 is a `hidden beast` number, since 1 + 9 + 8 + 640 + 3 + 2 + 3 = 666.

198640323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198640323 - 2⁸ = 198640067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198640303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 525315 + ... + 525692.

It is an arithmetic number, because the mean of its divisors is an integer number (21020160).

Almost surely, 2^198640323 is an apocalyptic number.

198640323 is a deficient number, since it is larger than the sum of its proper divisors (137682237).

198640323 is a wasteful number, since it uses less digits than its factorization.

198640323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051023 (or 1051017 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 198640323 is about 14093.9818007545. The cubic root of 198640323 is about 583.4752931959.

The spelling of 198640323 in words is "one hundred ninety-eight million, six hundred forty thousand, three hundred twenty-three".