198000123787 has 4 divisors (see below), whose sum is σ = 198849909960. Its totient is φ = 197150337616.

The previous prime is 198000123781. The next prime is 198000123791. The reversal of 198000123787 is 787321000891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 198000123787 - 2³ = 198000123779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198000123781) 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, 424892737 + ... + 424893202.

It is an arithmetic number, because the mean of its divisors is an integer number (49712477490).

Almost surely, 2^198000123787 is an apocalyptic number.

198000123787 is a deficient number, since it is larger than the sum of its proper divisors (849786173).

198000123787 is an equidigital number, since it uses as much as digits as its factorization.

198000123787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849786172.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 198000123787 in words is "one hundred ninety-eight billion, one hundred twenty-three thousand, seven hundred eighty-seven".