198449939 has 2 divisors, whose sum is σ = 198449940. Its totient is φ = 198449938.

The previous prime is 198449903. The next prime is 198450017. The reversal of 198449939 is 939944891.

198449939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198449939 - 2¹² = 198445843 is a prime.

It is not a weakly prime, because it can be changed into another prime (198449039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99224969 + 99224970.

It is an arithmetic number, because the mean of its divisors is an integer number (99224970).

Almost surely, 2^198449939 is an apocalyptic number.

198449939 is a deficient number, since it is larger than the sum of its proper divisors (1).

198449939 is an equidigital number, since it uses as much as digits as its factorization.

198449939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 56.

The square root of 198449939 is about 14087.2260931668. The cubic root of 198449939 is about 583.2888257380.

It can be divided in two parts, 1984499 and 39, that multiplied together give a triangular number (77395461 = T₁₂₄₄₁).

The spelling of 198449939 in words is "one hundred ninety-eight million, four hundred forty-nine thousand, nine hundred thirty-nine".