998919 has 8 divisors (see below), whose sum is σ = 1479920. Its totient is φ = 665928.

The previous prime is 998917. The next prime is 998927. The reversal of 998919 is 919899.

It is not a de Polignac number, because 998919 - 2¹ = 998917 is a prime.

It is a super-2 number, since 2×998919² = 1995678337122, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18472 + ... + 18525.

It is an arithmetic number, because the mean of its divisors is an integer number (184990).

2⁹⁹⁸⁹¹⁹ is an apocalyptic number.

998919 is a deficient number, since it is larger than the sum of its proper divisors (481001).

998919 is a wasteful number, since it uses less digits than its factorization.

998919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37006 (or 37000 counting only the distinct ones).

The product of its digits is 52488, while the sum is 45.

The square root of 998919 is about 999.4593538509. The cubic root of 998919 is about 99.9639536749.

The spelling of 998919 in words is "nine hundred ninety-eight thousand, nine hundred nineteen".