3646404 has 48 divisors (see below), whose sum is σ = 9956800. Its totient is φ = 1150848.

The previous prime is 3646399. The next prime is 3646411. The reversal of 3646404 is 4046463.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1164 + ... + 2940.

Almost surely, 2^3646404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3646404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4978400).

3646404 is an abundant number, since it is smaller than the sum of its proper divisors (6310396).

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

3646404 is a wasteful number, since it uses less digits than its factorization.

3646404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809 (or 1801 counting only the distinct ones).

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

The square root of 3646404 is about 1909.5559693290. Note that the first 3 decimals coincide. The cubic root of 3646404 is about 153.9175923864.

The spelling of 3646404 in words is "three million, six hundred forty-six thousand, four hundred four".