1098440 has 32 divisors (see below), whose sum is σ = 2825280. Its totient is φ = 376512.

The previous prime is 1098439. The next prime is 1098443. The reversal of 1098440 is 448901.

1098440 = T₁₄₁ + T₁₄₂ + ... + T₂₁₀.

It is not an unprimeable number, because it can be changed into a prime (1098443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1682 + ... + 2241.

It is an arithmetic number, because the mean of its divisors is an integer number (88290).

2^1098440 is an apocalyptic number.

1098440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1098440 is an abundant number, since it is smaller than the sum of its proper divisors (1726840).

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

1098440 is a wasteful number, since it uses less digits than its factorization.

1098440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941 (or 3937 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1098440 is about 1048.0648834877. The cubic root of 1098440 is about 103.1791897626.

The spelling of 1098440 in words is "one million, ninety-eight thousand, four hundred forty".