198420139 has 2 divisors, whose sum is σ = 198420140. Its totient is φ = 198420138.

The previous prime is 198420133. The next prime is 198420151. The reversal of 198420139 is 931024891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198420139 - 2¹⁹ = 197895851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198420098 and 198420107.

It is not a weakly prime, because it can be changed into another prime (198420133) 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, 99210069 + 99210070.

It is an arithmetic number, because the mean of its divisors is an integer number (99210070).

Almost surely, 2^198420139 is an apocalyptic number.

198420139 is a deficient number, since it is larger than the sum of its proper divisors (1).

198420139 is an equidigital number, since it uses as much as digits as its factorization.

198420139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 198420139 is about 14086.1683576479. The cubic root of 198420139 is about 583.2596279846.

The spelling of 198420139 in words is "one hundred ninety-eight million, four hundred twenty thousand, one hundred thirty-nine".