198377989 has 4 divisors (see below), whose sum is σ = 198785824. Its totient is φ = 197970156.

The previous prime is 198377987. The next prime is 198378017. The reversal of 198377989 is 989773891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198377989 - 2¹ = 198377987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198377983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203187 + ... + 204160.

It is an arithmetic number, because the mean of its divisors is an integer number (49696456).

Almost surely, 2^198377989 is an apocalyptic number.

It is an amenable number.

198377989 is a deficient number, since it is larger than the sum of its proper divisors (407835).

198377989 is an equidigital number, since it uses as much as digits as its factorization.

198377989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407834.

The product of its digits is 6858432, while the sum is 61.

The square root of 198377989 is about 14084.6721296592. The cubic root of 198377989 is about 583.2183248278.

The spelling of 198377989 in words is "one hundred ninety-eight million, three hundred seventy-seven thousand, nine hundred eighty-nine".