2643975 has 24 divisors (see below), whose sum is σ = 4858320. Its totient is φ = 1409760.

The previous prime is 2643961. The next prime is 2643989. The reversal of 2643975 is 5793462.

2643975 is a `hidden beast` number, since 2 + 643 + 9 + 7 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (2643961) and next prime (2643989).

It is not a de Polignac number, because 2643975 - 2⁵ = 2643943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1284 + ... + 2633.

It is an arithmetic number, because the mean of its divisors is an integer number (202430).

2^2643975 is an apocalyptic number.

2643975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2643975 is a deficient number, since it is larger than the sum of its proper divisors (2214345).

2643975 is a wasteful number, since it uses less digits than its factorization.

2643975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936 (or 3925 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 2643975 is about 1626.0304425195. The cubic root of 2643975 is about 138.2777958057.

The spelling of 2643975 in words is "two million, six hundred forty-three thousand, nine hundred seventy-five".