2621859 has 16 divisors (see below), whose sum is σ = 3745440. Its totient is φ = 1625600.

The previous prime is 2621849. The next prime is 2621863. The reversal of 2621859 is 9581262.

It is a cyclic number.

It is not a de Polignac number, because 2621859 - 2⁸ = 2621603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2621819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4897 + ... + 5405.

It is an arithmetic number, because the mean of its divisors is an integer number (234090).

2^2621859 is an apocalyptic number.

2621859 is a deficient number, since it is larger than the sum of its proper divisors (1123581).

2621859 is a wasteful number, since it uses less digits than its factorization.

2621859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630.

The product of its digits is 8640, while the sum is 33.

The square root of 2621859 is about 1619.2155508147. The cubic root of 2621859 is about 137.8911660283.

The spelling of 2621859 in words is "two million, six hundred twenty-one thousand, eight hundred fifty-nine".