2705621 has 4 divisors (see below), whose sum is σ = 2733612. Its totient is φ = 2677632.

The previous prime is 2705617. The next prime is 2705623. The reversal of 2705621 is 1265072.

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 2235025 + 470596 = 1495^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 2705621 - 2² = 2705617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2705623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13850 + ... + 14043.

It is an arithmetic number, because the mean of its divisors is an integer number (683403).

2^2705621 is an apocalyptic number.

It is an amenable number.

2705621 is a deficient number, since it is larger than the sum of its proper divisors (27991).

2705621 is an equidigital number, since it uses as much as digits as its factorization.

2705621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27990.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 2705621 is about 1644.8771990638. The cubic root of 2705621 is about 139.3442290318.

The spelling of 2705621 in words is "two million, seven hundred five thousand, six hundred twenty-one".