998619 has 4 divisors (see below), whose sum is σ = 1331496. Its totient is φ = 665744.

The previous prime is 998617. The next prime is 998623. The reversal of 998619 is 916899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 916899 = 3 ⋅305633.

It is a cyclic number.

It is not a de Polignac number, because 998619 - 2¹ = 998617 is a prime.

It is a super-2 number, since 2×998619² = 1994479814322, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (998617) 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, 166434 + ... + 166439.

It is an arithmetic number, because the mean of its divisors is an integer number (332874).

2⁹⁹⁸⁶¹⁹ is an apocalyptic number.

998619 is a deficient number, since it is larger than the sum of its proper divisors (332877).

998619 is a wasteful number, since it uses less digits than its factorization.

998619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332876.

The product of its digits is 34992, while the sum is 42.

The square root of 998619 is about 999.3092614401. The cubic root of 998619 is about 99.9539454597.

The spelling of 998619 in words is "nine hundred ninety-eight thousand, six hundred nineteen".