3665401 has 2 divisors, whose sum is σ = 3665402. Its totient is φ = 3665400.

The previous prime is 3665399. The next prime is 3665407. The reversal of 3665401 is 1045663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3154176 + 511225 = 1776^2 + 715^2 .

It is an emirp because it is prime and its reverse (1045663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3665401 - 2¹ = 3665399 is a prime.

Together with 3665399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3665407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1832700 + 1832701.

It is an arithmetic number, because the mean of its divisors is an integer number (1832701).

Almost surely, 2^3665401 is an apocalyptic number.

It is an amenable number.

3665401 is a deficient number, since it is larger than the sum of its proper divisors (1).

3665401 is an equidigital number, since it uses as much as digits as its factorization.

3665401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 3665401 is about 1914.5237005584. The cubic root of 3665401 is about 154.1844223361.

The spelling of 3665401 in words is "three million, six hundred sixty-five thousand, four hundred one".