3641405 has 4 divisors (see below), whose sum is σ = 4369692. Its totient is φ = 2913120.

The previous prime is 3641401. The next prime is 3641423. The reversal of 3641405 is 5041463.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 606841 + 3034564 = 779^2 + 1742^2 .

It is not a de Polignac number, because 3641405 - 2² = 3641401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3641401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364136 + ... + 364145.

It is an arithmetic number, because the mean of its divisors is an integer number (1092423).

Almost surely, 2^3641405 is an apocalyptic number.

It is an amenable number.

3641405 is a deficient number, since it is larger than the sum of its proper divisors (728287).

3641405 is an equidigital number, since it uses as much as digits as its factorization.

3641405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728286.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 3641405 is about 1908.2465773584. The cubic root of 3641405 is about 153.8472229733.

Adding to 3641405 its reverse (5041463), we get a palindrome (8682868).

The spelling of 3641405 in words is "three million, six hundred forty-one thousand, four hundred five".