1720406018 has 12 divisors (see below), whose sum is σ = 2741339922. Its totient is φ = 809602560.

The previous prime is 1720406011. The next prime is 1720406021. The reversal of 1720406018 is 8106040271.

It can be written as a sum of positive squares in 3 ways, for example, as 1710401449 + 10004569 = 41357^2 + 3163^2 .

It is not an unprimeable number, because it can be changed into a prime (1720406011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1487663 + ... + 1488818.

Almost surely, 2^1720406018 is an apocalyptic number.

1720406018 is a deficient number, since it is larger than the sum of its proper divisors (1020933904).

1720406018 is a wasteful number, since it uses less digits than its factorization.

1720406018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976517 (or 2976500 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1720406018 is about 41477.7773994702. Note that the first 3 decimals coincide. The cubic root of 1720406018 is about 1198.2395524128.

Adding to 1720406018 its reverse (8106040271), we get a palindrome (9826446289).

The spelling of 1720406018 in words is "one billion, seven hundred twenty million, four hundred six thousand, eighteen".