3665406 has 16 divisors (see below), whose sum is σ = 7501824. Its totient is φ = 1193304.

The previous prime is 3665401. The next prime is 3665407. The reversal of 3665406 is 6045663.

It is a super-2 number, since 2×3665406² = 26870402289672, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3⁶ + 6⁵ + 6⁵ + 5⁹ + 4⁷ + 0 + 6⁸ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665401) 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, 6846 + ... + 7361.

It is an arithmetic number, because the mean of its divisors is an integer number (468864).

Almost surely, 2^3665406 is an apocalyptic number.

3665406 is an abundant number, since it is smaller than the sum of its proper divisors (3836418).

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

3665406 is a wasteful number, since it uses less digits than its factorization.

3665406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14255.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 3665406 is about 1914.5250063658. The cubic root of 3665406 is about 154.1844924441.

The spelling of 3665406 in words is "three million, six hundred sixty-five thousand, four hundred six".