718021 has 4 divisors (see below), whose sum is σ = 720000. Its totient is φ = 716044.

The previous prime is 718007. The next prime is 718043. The reversal of 718021 is 120817.

718021 is nontrivially palindromic in base 5.

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 718021 - 2⁵ = 717989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 718021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718051) 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 3 ways as a sum of consecutive naturals, for example, 271 + ... + 1228.

It is an arithmetic number, because the mean of its divisors is an integer number (180000).

2⁷¹⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

718021 is a deficient number, since it is larger than the sum of its proper divisors (1979).

718021 is a wasteful number, since it uses less digits than its factorization.

718021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 718021 is about 847.3611980732. The cubic root of 718021 is about 89.5459019871.

Adding to 718021 its reverse (120817), we get a palindrome (838838).

The spelling of 718021 in words is "seven hundred eighteen thousand, twenty-one".