198977877 has 72 divisors (see below), whose sum is σ = 367488576. Its totient is φ = 106904448.

The previous prime is 198977839. The next prime is 198977893. The reversal of 198977877 is 778779891.

It is a happy number.

It is not a de Polignac number, because 198977877 - 2⁸ = 198977621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

Its product of digits (12446784) is a multiple of the sum of its prime factors (1029).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198973877) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 201928 + ... + 202910.

It is an arithmetic number, because the mean of its divisors is an integer number (5104008).

Almost surely, 2^198977877 is an apocalyptic number.

198977877 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

198977877 is a deficient number, since it is larger than the sum of its proper divisors (168510699).

198977877 is an equidigital number, since it uses as much as digits as its factorization.

198977877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 1010 counting only the distinct ones).

The product of its digits is 12446784, while the sum is 63.

The square root of 198977877 is about 14105.9518289267. The cubic root of 198977877 is about 583.8056104217.

The spelling of 198977877 in words is "one hundred ninety-eight million, nine hundred seventy-seven thousand, eight hundred seventy-seven".