3651804 has 108 divisors (see below), whose sum is σ = 10951304. Its totient is φ = 1057536.

The previous prime is 3651797. The next prime is 3651811. The reversal of 3651804 is 4081563.

3651804 is a `hidden beast` number, since 3 + 651 + 8 + 0 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (3651797) and next prime (3651811).

It is a tau number, because it is divible by the number of its divisors (108).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 214804 + ... + 214820.

Almost surely, 2^3651804 is an apocalyptic number.

3651804 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3651804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5475652).

3651804 is an abundant number, since it is smaller than the sum of its proper divisors (7299500).

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

3651804 is a wasteful number, since it uses less digits than its factorization.

3651804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 35 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 3651804 is about 1910.9693875099. The cubic root of 3651804 is about 153.9935343325.

The spelling of 3651804 in words is "three million, six hundred fifty-one thousand, eight hundred four".