2642721 has 4 divisors (see below), whose sum is σ = 3523632. Its totient is φ = 1761812.

The previous prime is 2642713. The next prime is 2642771. The reversal of 2642721 is 1272462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2642721 - 2³ = 2642713 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 2642691 and 2642700.

It is not an unprimeable number, because it can be changed into a prime (2642771) 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, 440451 + ... + 440456.

It is an arithmetic number, because the mean of its divisors is an integer number (880908).

2^2642721 is an apocalyptic number.

It is an amenable number.

2642721 is a deficient number, since it is larger than the sum of its proper divisors (880911).

2642721 is an equidigital number, since it uses as much as digits as its factorization.

2642721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880910.

The product of its digits is 1344, while the sum is 24.

The square root of 2642721 is about 1625.6447951505. The cubic root of 2642721 is about 138.2559312801.

The spelling of 2642721 in words is "two million, six hundred forty-two thousand, seven hundred twenty-one".