2665723 has 4 divisors (see below), whose sum is σ = 2781648. Its totient is φ = 2549800.

The previous prime is 2665717. The next prime is 2665727. The reversal of 2665723 is 3275662.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2665723 is a prime.

It is a super-2 number, since 2×2665723² = 14212158225458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665727) 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, 57928 + ... + 57973.

It is an arithmetic number, because the mean of its divisors is an integer number (695412).

2^2665723 is an apocalyptic number.

2665723 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2665723 is a deficient number, since it is larger than the sum of its proper divisors (115925).

2665723 is a wasteful number, since it uses less digits than its factorization.

2665723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115924.

The product of its digits is 15120, while the sum is 31.

The square root of 2665723 is about 1632.7041985614. The cubic root of 2665723 is about 138.6558953922.

The spelling of 2665723 in words is "two million, six hundred sixty-five thousand, seven hundred twenty-three".