2172726443 has 4 divisors (see below), whose sum is σ = 2194238688. Its totient is φ = 2151214200.

The previous prime is 2172726431. The next prime is 2172726449. The reversal of 2172726443 is 3446272712.

It is a happy number.

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 2172726443 - 2⁴ = 2172726427 is a prime.

It is a super-2 number, since 2×2172726443² = 9441480392222864498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2172726397 and 2172726406.

It is not an unprimeable number, because it can be changed into a prime (2172726449) 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, 10755971 + ... + 10756172.

It is an arithmetic number, because the mean of its divisors is an integer number (548559672).

Almost surely, 2^2172726443 is an apocalyptic number.

2172726443 is a deficient number, since it is larger than the sum of its proper divisors (21512245).

2172726443 is a wasteful number, since it uses less digits than its factorization.

2172726443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21512244.

The product of its digits is 112896, while the sum is 38.

The square root of 2172726443 is about 46612.5138026260. The cubic root of 2172726443 is about 1295.1945748988.

The spelling of 2172726443 in words is "two billion, one hundred seventy-two million, seven hundred twenty-six thousand, four hundred forty-three".