3640811 has 4 divisors (see below), whose sum is σ = 3646512. Its totient is φ = 3635112.

The previous prime is 3640807. The next prime is 3640817. The reversal of 3640811 is 1180463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1180463 = 17 ⋅69439.

It is a cyclic number.

It is not a de Polignac number, because 3640811 - 2² = 3640807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3640817) 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, 1751 + ... + 3216.

It is an arithmetic number, because the mean of its divisors is an integer number (911628).

Almost surely, 2^3640811 is an apocalyptic number.

3640811 is a deficient number, since it is larger than the sum of its proper divisors (5701).

3640811 is an equidigital number, since it uses as much as digits as its factorization.

3640811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 3640811 is about 1908.0909307473. The cubic root of 3640811 is about 153.8388571347.

The spelling of 3640811 in words is "three million, six hundred forty thousand, eight hundred eleven".