998955 has 24 divisors (see below), whose sum is σ = 1759680. Its totient is φ = 524160.

The previous prime is 998951. The next prime is 998957. The reversal of 998955 is 559899.

It is not a de Polignac number, because 998955 - 2² = 998951 is a prime.

It is a super-2 number, since 2×998955² = 1995822184050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 998955.

It is not an unprimeable number, because it can be changed into a prime (998951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3415 + ... + 3695.

It is an arithmetic number, because the mean of its divisors is an integer number (73320).

2⁹⁹⁸⁹⁵⁵ is an apocalyptic number.

998955 is a deficient number, since it is larger than the sum of its proper divisors (760725).

998955 is a wasteful number, since it uses less digits than its factorization.

998955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 368 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 998955 is about 999.4773634255. The cubic root of 998955 is about 99.9651545260.

It can be divided in two parts, 998 and 955, that added together give a triangular number (1953 = T₆₂).

The spelling of 998955 in words is "nine hundred ninety-eight thousand, nine hundred fifty-five".