198380977 has 4 divisors (see below), whose sum is σ = 198420516. Its totient is φ = 198341440.

The previous prime is 198380971. The next prime is 198380983. The reversal of 198380977 is 779083891.

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

It is an interprime number because it is at equal distance from previous prime (198380971) and next prime (198380983).

It can be written as a sum of positive squares in 2 ways, for example, as 173290896 + 25090081 = 13164^2 + 5009^2 .

It is a cyclic number.

It is not a de Polignac number, because 198380977 - 2²⁷ = 64163249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198380971) 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, 10924 + ... + 22717.

It is an arithmetic number, because the mean of its divisors is an integer number (49605129).

Almost surely, 2^198380977 is an apocalyptic number.

It is an amenable number.

198380977 is a deficient number, since it is larger than the sum of its proper divisors (39539).

198380977 is an equidigital number, since it uses as much as digits as its factorization.

198380977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39538.

The product of its (nonzero) digits is 762048, while the sum is 52.

The square root of 198380977 is about 14084.7782020165. The cubic root of 198380977 is about 583.2212529881.

The spelling of 198380977 in words is "one hundred ninety-eight million, three hundred eighty thousand, nine hundred seventy-seven".