1722118 has 4 divisors (see below), whose sum is σ = 2583180. Its totient is φ = 861058.

The previous prime is 1722113. The next prime is 1722131. The reversal of 1722118 is 8112271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8112271 = 73 ⋅111127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1722113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430528 + ... + 430531.

It is an arithmetic number, because the mean of its divisors is an integer number (645795).

2^1722118 is an apocalyptic number.

1722118 is a deficient number, since it is larger than the sum of its proper divisors (861062).

1722118 is an equidigital number, since it uses as much as digits as its factorization.

1722118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861061.

The product of its digits is 224, while the sum is 22.

The square root of 1722118 is about 1312.2949363615. The cubic root of 1722118 is about 119.8636878094.

Adding to 1722118 its reverse (8112271), we get a palindrome (9834389).

The spelling of 1722118 in words is "one million, seven hundred twenty-two thousand, one hundred eighteen".