2721923 has 4 divisors (see below), whose sum is σ = 2725968. Its totient is φ = 2717880.

The previous prime is 2721913. The next prime is 2721947. The reversal of 2721923 is 3291272.

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

It is a cyclic number.

It is not a de Polignac number, because 2721923 - 2¹⁰ = 2720899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2721892 and 2721901.

It is not an unprimeable number, because it can be changed into a prime (2721913) 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, 743 + ... + 2448.

It is an arithmetic number, because the mean of its divisors is an integer number (681492).

2^2721923 is an apocalyptic number.

2721923 is a deficient number, since it is larger than the sum of its proper divisors (4045).

2721923 is an equidigital number, since it uses as much as digits as its factorization.

2721923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044.

The product of its digits is 1512, while the sum is 26.

The square root of 2721923 is about 1649.8251422499. The cubic root of 2721923 is about 139.6235293656.

The spelling of 2721923 in words is "two million, seven hundred twenty-one thousand, nine hundred twenty-three".