2640869 has 8 divisors (see below), whose sum is σ = 3292608. Its totient is φ = 2057760.

The previous prime is 2640863. The next prime is 2640871. The reversal of 2640869 is 9680462.

2640869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2640869 - 2⁴ = 2640853 is a prime.

It is a super-2 number, since 2×2640869² = 13948378150322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640863) 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 7 ways as a sum of consecutive naturals, for example, 17072 + ... + 17225.

It is an arithmetic number, because the mean of its divisors is an integer number (411576).

2^2640869 is an apocalyptic number.

It is an amenable number.

2640869 is a deficient number, since it is larger than the sum of its proper divisors (651739).

2640869 is a wasteful number, since it uses less digits than its factorization.

2640869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34315.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 2640869 is about 1625.0750751888. The cubic root of 2640869 is about 138.2236274765.

The spelling of 2640869 in words is "two million, six hundred forty thousand, eight hundred sixty-nine".