2640723 has 8 divisors (see below), whose sum is σ = 3530688. Its totient is φ = 1755624.

The previous prime is 2640721. The next prime is 2640739. The reversal of 2640723 is 3270462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2640723 - 2¹ = 2640721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2640693 and 2640702.

It is not an unprimeable number, because it can be changed into a prime (2640721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336 + ... + 2322.

It is an arithmetic number, because the mean of its divisors is an integer number (441336).

2^2640723 is an apocalyptic number.

2640723 is a deficient number, since it is larger than the sum of its proper divisors (889965).

2640723 is a wasteful number, since it uses less digits than its factorization.

2640723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433.

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 2640723 is about 1625.0301535664. The cubic root of 2640723 is about 138.2210802062.

The spelling of 2640723 in words is "two million, six hundred forty thousand, seven hundred twenty-three".