198126649 has 6 divisors (see below), whose sum is σ = 230473914. Its totient is φ = 169822800.

The previous prime is 198126631. The next prime is 198126713. The reversal of 198126649 is 946621891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 145636624 + 52490025 = 12068^2 + 7245^2 .

It is not a de Polignac number, because 198126649 - 2¹¹ = 198124601 is a prime.

It is a super-3 number, since 3×198126649³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198126599 and 198126608.

It is not an unprimeable number, because it can be changed into a prime (198124649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2021652 + ... + 2021749.

It is an arithmetic number, because the mean of its divisors is an integer number (38412319).

Almost surely, 2^198126649 is an apocalyptic number.

It is an amenable number.

198126649 is a deficient number, since it is larger than the sum of its proper divisors (32347265).

198126649 is an equidigital number, since it uses as much as digits as its factorization.

198126649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043415 (or 4043408 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 198126649 is about 14075.7468363139. The cubic root of 198126649 is about 582.9719130072.

The spelling of 198126649 in words is "one hundred ninety-eight million, one hundred twenty-six thousand, six hundred forty-nine".