2855921 has 4 divisors (see below), whose sum is σ = 2888100. Its totient is φ = 2823744.

The previous prime is 2855911. The next prime is 2855927. The reversal of 2855921 is 1295582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 215296 + 2640625 = 464^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 2855921 - 2⁶ = 2855857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2855927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15956 + ... + 16133.

It is an arithmetic number, because the mean of its divisors is an integer number (722025).

2^2855921 is an apocalyptic number.

It is an amenable number.

2855921 is a deficient number, since it is larger than the sum of its proper divisors (32179).

2855921 is an equidigital number, since it uses as much as digits as its factorization.

2855921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32178.

The product of its digits is 7200, while the sum is 32.

The square root of 2855921 is about 1689.9470405903. The cubic root of 2855921 is about 141.8781107044.

The spelling of 2855921 in words is "two million, eight hundred fifty-five thousand, nine hundred twenty-one".