1722871845 has 12 divisors (see below), whose sum is σ = 2986311276. Its totient is φ = 918864960.

The previous prime is 1722871831. The next prime is 1722871847. The reversal of 1722871845 is 5481782271.

It can be written as a sum of positive squares in 2 ways, for example, as 282441636 + 1440430209 = 16806^2 + 37953^2 .

It is not a de Polignac number, because 1722871845 - 2²⁴ = 1706094629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 38286041 = 1722871845 / (1 + 7 + 2 + 2 + 8 + 7 + 1 + 8 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1722871845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722871847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19142976 + ... + 19143065.

It is an arithmetic number, because the mean of its divisors is an integer number (248859273).

Almost surely, 2^1722871845 is an apocalyptic number.

1722871845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1722871845 is a deficient number, since it is larger than the sum of its proper divisors (1263439431).

1722871845 is a wasteful number, since it uses less digits than its factorization.

1722871845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38286052 (or 38286049 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 1722871845 is about 41507.4914322704. The cubic root of 1722871845 is about 1198.8117508583.

The spelling of 1722871845 in words is "one billion, seven hundred twenty-two million, eight hundred seventy-one thousand, eight hundred forty-five".