1718724421 has 4 divisors (see below), whose sum is σ = 1729016352. Its totient is φ = 1708432492.

The previous prime is 1718724391. The next prime is 1718724433. The reversal of 1718724421 is 1244278171.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1718724421 - 2²⁵ = 1685169989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1718724461) 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, 5145715 + ... + 5146048.

It is an arithmetic number, because the mean of its divisors is an integer number (432254088).

Almost surely, 2^1718724421 is an apocalyptic number.

It is an amenable number.

1718724421 is a deficient number, since it is larger than the sum of its proper divisors (10291931).

1718724421 is a wasteful number, since it uses less digits than its factorization.

1718724421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10291930.

The product of its digits is 25088, while the sum is 37.

The square root of 1718724421 is about 41457.5013839474. The cubic root of 1718724421 is about 1197.8490219463.

The spelling of 1718724421 in words is "one billion, seven hundred eighteen million, seven hundred twenty-four thousand, four hundred twenty-one".