3640843 has 2 divisors, whose sum is σ = 3640844. Its totient is φ = 3640842.

The previous prime is 3640829. The next prime is 3640849. The reversal of 3640843 is 3480463.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3640843 - 2⁹ = 3640331 is a prime.

It is equal to p₂₅₉₄₈₀ and since 3640843 and 259480 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (3640849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820421 + 1820422.

It is an arithmetic number, because the mean of its divisors is an integer number (1820422).

Almost surely, 2^3640843 is an apocalyptic number.

3640843 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640843 is an equidigital number, since it uses as much as digits as its factorization.

3640843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 3640843 is about 1908.0993160735. The cubic root of 3640843 is about 153.8393078428.

The spelling of 3640843 in words is "three million, six hundred forty thousand, eight hundred forty-three".