3655540 has 24 divisors (see below), whose sum is σ = 8773632. Its totient is φ = 1253280.

The previous prime is 3655513. The next prime is 3655541. The reversal of 3655540 is 455563.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 3655499 and 3655508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3655541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12916 + ... + 13195.

It is an arithmetic number, because the mean of its divisors is an integer number (365568).

Almost surely, 2^3655540 is an apocalyptic number.

It is an amenable number.

3655540 is an abundant number, since it is smaller than the sum of its proper divisors (5118092).

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

3655540 is a wasteful number, since it uses less digits than its factorization.

3655540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26127 (or 26125 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 3655540 is about 1911.9466519754. The cubic root of 3655540 is about 154.0460311040.

The spelling of 3655540 in words is "three million, six hundred fifty-five thousand, five hundred forty".