998554 has 4 divisors (see below), whose sum is σ = 1497834. Its totient is φ = 499276.

The previous prime is 998551. The next prime is 998561. The reversal of 998554 is 455899.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 458329 = 735^2 + 677^2 .

It is a super-2 number, since 2×998554² = 1994220181832, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (998551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249637 + ... + 249640.

2⁹⁹⁸⁵⁵⁴ is an apocalyptic number.

998554 is a deficient number, since it is larger than the sum of its proper divisors (499280).

998554 is a wasteful number, since it uses less digits than its factorization.

998554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499279.

The product of its digits is 64800, while the sum is 40.

The square root of 998554 is about 999.2767384464. The cubic root of 998554 is about 99.9517767489.

The spelling of 998554 in words is "nine hundred ninety-eight thousand, five hundred fifty-four".