3555840 has 80 divisors (see below), whose sum is σ = 11392128. Its totient is φ = 946176.

The previous prime is 3555833. The next prime is 3555857. The reversal of 3555840 is 485553.

3555840 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 3555798 and 3555807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7449 + ... + 7911.

Almost surely, 2^3555840 is an apocalyptic number.

3555840 is a gapful number since it is divisible by the number (30) 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 3555840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5696064).

3555840 is an abundant number, since it is smaller than the sum of its proper divisors (7836288).

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

3555840 is an equidigital number, since it uses as much as digits as its factorization.

3555840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 3555840 is about 1885.6935063790. The cubic root of 3555840 is about 152.6326356603.

The spelling of 3555840 in words is "three million, five hundred fifty-five thousand, eight hundred forty".