3640641 has 4 divisors (see below), whose sum is σ = 4854192. Its totient is φ = 2427092.

The previous prime is 3640633. The next prime is 3640643. The reversal of 3640641 is 1460463.

3640641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1460463 = 3 ⋅486821.

It is a cyclic number.

It is not a de Polignac number, because 3640641 - 2³ = 3640633 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3640643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606771 + ... + 606776.

It is an arithmetic number, because the mean of its divisors is an integer number (1213548).

Almost surely, 2^3640641 is an apocalyptic number.

It is an amenable number.

3640641 is a deficient number, since it is larger than the sum of its proper divisors (1213551).

3640641 is a wasteful number, since it uses less digits than its factorization.

3640641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213550.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 3640641 is about 1908.0463830840. The cubic root of 3640641 is about 153.8364627036.

The spelling of 3640641 in words is "three million, six hundred forty thousand, six hundred forty-one".