3621440 has 28 divisors (see below), whose sum is σ = 8624316. Its totient is φ = 1448448.

The previous prime is 3621403. The next prime is 3621461. The reversal of 3621440 is 441263.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2637376 + 984064 = 1624^2 + 992^2 .

It is a super-2 number, since 2×3621440² = 26229655347200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5339 + ... + 5978.

Almost surely, 2^3621440 is an apocalyptic number.

It is an amenable number.

3621440 is an abundant number, since it is smaller than the sum of its proper divisors (5002876).

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

3621440 is a wasteful number, since it uses less digits than its factorization.

3621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11334 (or 11324 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 3621440 is about 1903.0081450167. The cubic root of 3621440 is about 153.5655376967.

The spelling of 3621440 in words is "three million, six hundred twenty-one thousand, four hundred forty".