3655440 has 60 divisors (see below), whose sum is σ = 12278604. Its totient is φ = 974592.

The previous prime is 3655423. The next prime is 3655447. The reversal of 3655440 is 445563.

3655440 is a `hidden beast` number, since 3 + 655 + 4 + 4 + 0 = 666.

3655440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2663424 + 992016 = 1632^2 + 996^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3655447) 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 11 ways as a sum of consecutive naturals, for example, 1819 + ... + 3258.

Almost surely, 2^3655440 is an apocalyptic number.

3655440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3655440 is an abundant number, since it is smaller than the sum of its proper divisors (8623164).

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

3655440 is a wasteful number, since it uses less digits than its factorization.

3655440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096 (or 5087 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 3655440 is about 1911.9205004393. The cubic root of 3655440 is about 154.0446264102.

It can be divided in two parts, 3655 and 440, that added together give a triangular number (4095 = T₉₀).

The spelling of 3655440 in words is "three million, six hundred fifty-five thousand, four hundred forty".