998740189 has 2 divisors, whose sum is σ = 998740190. Its totient is φ = 998740188.

The previous prime is 998740181. The next prime is 998740213. The reversal of 998740189 is 981047899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 502208100 + 496532089 = 22410^2 + 22283^2 .

It is a cyclic number.

It is not a de Polignac number, because 998740189 - 2³ = 998740181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998740181) 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, 499370094 + 499370095.

It is an arithmetic number, because the mean of its divisors is an integer number (499370095).

Almost surely, 2^998740189 is an apocalyptic number.

It is an amenable number.

998740189 is a deficient number, since it is larger than the sum of its proper divisors (1).

998740189 is an equidigital number, since it uses as much as digits as its factorization.

998740189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 998740189 is about 31602.8509631647. The cubic root of 998740189 is about 999.5798865294.

It can be divided in two parts, 9987 and 40189, that added together give a square (50176 = 224²).

The spelling of 998740189 in words is "nine hundred ninety-eight million, seven hundred forty thousand, one hundred eighty-nine".