2620891 has 16 divisors (see below), whose sum is σ = 3273984. Its totient is φ = 2042784.

The previous prime is 2620883. The next prime is 2620897. The reversal of 2620891 is 1980262.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2620891 - 2³ = 2620883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2620897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7380 + ... + 7726.

It is an arithmetic number, because the mean of its divisors is an integer number (204624).

2^2620891 is an apocalyptic number.

2620891 is a deficient number, since it is larger than the sum of its proper divisors (653093).

2620891 is a wasteful number, since it uses less digits than its factorization.

2620891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2620891 is about 1618.9166130471. The cubic root of 2620891 is about 137.8741939639.

The spelling of 2620891 in words is "two million, six hundred twenty thousand, eight hundred ninety-one".