3687840 has 144 divisors (see below), whose sum is σ = 13621608. Its totient is φ = 903168.

The previous prime is 3687839. The next prime is 3687847. The reversal of 3687840 is 487863.

It can be written as a sum of positive squares in 4 ways, for example, as 3283344 + 404496 = 1812^2 + 636^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3687795 and 3687804.

It is not an unprimeable number, because it can be changed into a prime (3687847) 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, 18622 + ... + 18818.

Almost surely, 2^3687840 is an apocalyptic number.

3687840 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 3687840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6810804).

3687840 is an abundant number, since it is smaller than the sum of its proper divisors (9933768).

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

3687840 is a wasteful number, since it uses less digits than its factorization.

3687840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 3687840 is about 1920.3749633861. The cubic root of 3687840 is about 154.4984132806.

The spelling of 3687840 in words is "three million, six hundred eighty-seven thousand, eight hundred forty".