3638540 has 12 divisors (see below), whose sum is σ = 7640976. Its totient is φ = 1455408.

The previous prime is 3638521. The next prime is 3638549. The reversal of 3638540 is 458363.

It is not an unprimeable number, because it can be changed into a prime (3638549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90944 + ... + 90983.

It is an arithmetic number, because the mean of its divisors is an integer number (636748).

Almost surely, 2^3638540 is an apocalyptic number.

It is an amenable number.

3638540 is an abundant number, since it is smaller than the sum of its proper divisors (4002436).

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

3638540 is a wasteful number, since it uses less digits than its factorization.

3638540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181936 (or 181934 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 3638540 is about 1907.4957404933. The cubic root of 3638540 is about 153.8068641977.

The spelling of 3638540 in words is "three million, six hundred thirty-eight thousand, five hundred forty".