2172723 has 16 divisors (see below), whose sum is σ = 3336960. Its totient is φ = 1231776.

The previous prime is 2172721. The next prime is 2172727. The reversal of 2172723 is 3272712.

It is not a de Polignac number, because 2172723 - 2¹ = 2172721 is a prime.

2172723 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2172693 and 2172702.

It is not an unprimeable number, because it can be changed into a prime (2172721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2968 + ... + 3626.

It is an arithmetic number, because the mean of its divisors is an integer number (208560).

2^2172723 is an apocalyptic number.

2172723 is a deficient number, since it is larger than the sum of its proper divisors (1164237).

2172723 is a wasteful number, since it uses less digits than its factorization.

2172723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826.

The product of its digits is 1176, while the sum is 24.

The square root of 2172723 is about 1474.0159429260. The cubic root of 2172723 is about 129.5193890757.

The spelling of 2172723 in words is "two million, one hundred seventy-two thousand, seven hundred twenty-three".