2640871 has 2 divisors, whose sum is σ = 2640872. Its totient is φ = 2640870.

The previous prime is 2640863. The next prime is 2640881. The reversal of 2640871 is 1780462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2640871 - 2³ = 2640863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2640821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320435 + 1320436.

It is an arithmetic number, because the mean of its divisors is an integer number (1320436).

2^2640871 is an apocalyptic number.

2640871 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640871 is an equidigital number, since it uses as much as digits as its factorization.

2640871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 2640871 is about 1625.0756905449. The cubic root of 2640871 is about 138.2236623700.

It can be divided in two parts, 2640 and 871, that multiplied together give a triangular number (2299440 = T₂₁₄₄).

The spelling of 2640871 in words is "two million, six hundred forty thousand, eight hundred seventy-one".