3644406 has 16 divisors (see below), whose sum is σ = 8098800. Its totient is φ = 1214784.

The previous prime is 3644357. The next prime is 3644411. The reversal of 3644406 is 6044463.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 3644406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33691 + ... + 33798.

It is an arithmetic number, because the mean of its divisors is an integer number (506175).

Almost surely, 2^3644406 is an apocalyptic number.

3644406 is an abundant number, since it is smaller than the sum of its proper divisors (4454394).

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

3644406 is a wasteful number, since it uses less digits than its factorization.

3644406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67500 (or 67494 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 3644406 is about 1909.0327393735. The cubic root of 3644406 is about 153.8894748643.

Adding to 3644406 its reverse (6044463), we get a palindrome (9688869).

The spelling of 3644406 in words is "three million, six hundred forty-four thousand, four hundred six".