3561840 has 160 divisors (see below), whose sum is σ = 13124160. Its totient is φ = 884736.

The previous prime is 3561827. The next prime is 3561841. The reversal of 3561840 is 481653.

3561840 = 318² + 319² + ... + 349².

3561840 is a `hidden beast` number, since 3 + 5 + 618 + 40 = 666.

3561840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561841) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 36672 + ... + 36768.

It is an arithmetic number, because the mean of its divisors is an integer number (82026).

Almost surely, 2^3561840 is an apocalyptic number.

3561840 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 3561840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6562080).

3561840 is an abundant number, since it is smaller than the sum of its proper divisors (9562320).

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

3561840 is a wasteful number, since it uses less digits than its factorization.

3561840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 3561840 is about 1887.2837624480. The cubic root of 3561840 is about 152.7184364090.

The spelling of 3561840 in words is "three million, five hundred sixty-one thousand, eight hundred forty".