198928459 has 4 divisors (see below), whose sum is σ = 199668240. Its totient is φ = 198188680.

The previous prime is 198928453. The next prime is 198928463. The reversal of 198928459 is 954829891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 954829891 = 997 ⋅957703.

It is a cyclic number.

It is not a de Polignac number, because 198928459 - 2¹⁷ = 198797387 is a prime.

It is a super-2 number, since 2×198928459² = 79145063600229362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198928453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369487 + ... + 370024.

It is an arithmetic number, because the mean of its divisors is an integer number (49917060).

Almost surely, 2^198928459 is an apocalyptic number.

198928459 is a deficient number, since it is larger than the sum of its proper divisors (739781).

198928459 is an equidigital number, since it uses as much as digits as its factorization.

198928459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739780.

The product of its digits is 1866240, while the sum is 55.

The square root of 198928459 is about 14104.2000482126. The cubic root of 198928459 is about 583.7572752419.

The spelling of 198928459 in words is "one hundred ninety-eight million, nine hundred twenty-eight thousand, four hundred fifty-nine".