198423877 has 2 divisors, whose sum is σ = 198423878. Its totient is φ = 198423876.

The previous prime is 198423871. The next prime is 198423899. The reversal of 198423877 is 778324891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161772961 + 36650916 = 12719^2 + 6054^2 .

It is an emirp because it is prime and its reverse (778324891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198423877 - 2⁷ = 198423749 is a prime.

It is a super-2 number, since 2×198423877² = 78744069927422258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 198423877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198423871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99211938 + 99211939.

It is an arithmetic number, because the mean of its divisors is an integer number (99211939).

Almost surely, 2^198423877 is an apocalyptic number.

It is an amenable number.

198423877 is a deficient number, since it is larger than the sum of its proper divisors (1).

198423877 is an equidigital number, since it uses as much as digits as its factorization.

198423877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 49.

The square root of 198423877 is about 14086.3010403725. The cubic root of 198423877 is about 583.2632906014.

The spelling of 198423877 in words is "one hundred ninety-eight million, four hundred twenty-three thousand, eight hundred seventy-seven".