5518820 has 12 divisors (see below), whose sum is σ = 11589564. Its totient is φ = 2207520.

The previous prime is 5518819. The next prime is 5518831. The reversal of 5518820 is 288155.

It can be written as a sum of positive squares in 2 ways, for example, as 1582564 + 3936256 = 1258^2 + 1984^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137951 + ... + 137990.

It is an arithmetic number, because the mean of its divisors is an integer number (965797).

Almost surely, 2^5518820 is an apocalyptic number.

It is an amenable number.

5518820 is an abundant number, since it is smaller than the sum of its proper divisors (6070744).

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

5518820 is a wasteful number, since it uses less digits than its factorization.

5518820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275950 (or 275948 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 5518820 is about 2349.2168907957. The cubic root of 5518820 is about 176.7185243912.

The spelling of 5518820 in words is "five million, five hundred eighteen thousand, eight hundred twenty".