198678829 has 2 divisors, whose sum is σ = 198678830. Its totient is φ = 198678828.

The previous prime is 198678811. The next prime is 198678841. The reversal of 198678829 is 928876891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139358025 + 59320804 = 11805^2 + 7702^2 .

It is a cyclic number.

It is not a de Polignac number, because 198678829 - 2⁹ = 198678317 is a prime.

It is a super-2 number, since 2×198678829² = 78946554185622482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198678889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99339414 + 99339415.

It is an arithmetic number, because the mean of its divisors is an integer number (99339415).

Almost surely, 2^198678829 is an apocalyptic number.

It is an amenable number.

198678829 is a deficient number, since it is larger than the sum of its proper divisors (1).

198678829 is an equidigital number, since it uses as much as digits as its factorization.

198678829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 58.

The square root of 198678829 is about 14095.3477786112. The cubic root of 198678829 is about 583.5129925709.

The spelling of 198678829 in words is "one hundred ninety-eight million, six hundred seventy-eight thousand, eight hundred twenty-nine".