1098540 has 72 divisors (see below), whose sum is σ = 3538080. Its totient is φ = 274944.

The previous prime is 1098533. The next prime is 1098541. The reversal of 1098540 is 458901.

It is not an unprimeable number, because it can be changed into a prime (1098541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2881 + ... + 3239.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2^1098540 is an apocalyptic number.

1098540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1098540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769040).

1098540 is an abundant number, since it is smaller than the sum of its proper divisors (2439540).

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

1098540 is a wasteful number, since it uses less digits than its factorization.

1098540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1098540 is about 1048.1125893720. The cubic root of 1098540 is about 103.1823207501.

It can be divided in two parts, 10985 and 40, that added together give a square (11025 = 105²).

The spelling of 1098540 in words is "one million, ninety-eight thousand, five hundred forty".