2645647 has 2 divisors, whose sum is σ = 2645648. Its totient is φ = 2645646.

The previous prime is 2645639. The next prime is 2645651. The reversal of 2645647 is 7465462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2645647 - 2³ = 2645639 is a prime.

2645647 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1322823 + 1322824.

It is an arithmetic number, because the mean of its divisors is an integer number (1322824).

2^2645647 is an apocalyptic number.

2645647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2645647 is an equidigital number, since it uses as much as digits as its factorization.

2645647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 34.

The square root of 2645647 is about 1626.5444967784. The cubic root of 2645647 is about 138.3069377550.

The spelling of 2645647 in words is "two million, six hundred forty-five thousand, six hundred forty-seven".