1098918 has 12 divisors (see below), whose sum is σ = 2381028. Its totient is φ = 366300.

The previous prime is 1098847. The next prime is 1098953. The reversal of 1098918 is 8198901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30508 + ... + 30543.

It is an arithmetic number, because the mean of its divisors is an integer number (198419).

2^1098918 is an apocalyptic number.

1098918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1098918 is an abundant number, since it is smaller than the sum of its proper divisors (1282110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1098918 is a wasteful number, since it uses less digits than its factorization.

1098918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61059 (or 61056 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1098918 is about 1048.2928980013. The cubic root of 1098918 is about 103.1941541668.

It can be divided in two parts, 1098 and 918, that added together give a triangular number (2016 = T₆₃).

The spelling of 1098918 in words is "one million, ninety-eight thousand, nine hundred eighteen".