718421 has 8 divisors (see below), whose sum is σ = 789888. Its totient is φ = 648000.

The previous prime is 718411. The next prime is 718423. The reversal of 718421 is 124817.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 718421 - 2⁶ = 718357 is a prime.

It is a super-2 number, since 2×718421² = 1032257466482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2516 + ... + 2786.

It is an arithmetic number, because the mean of its divisors is an integer number (98736).

2⁷¹⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

718421 is a deficient number, since it is larger than the sum of its proper divisors (71467).

718421 is a wasteful number, since it uses less digits than its factorization.

718421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its digits is 448, while the sum is 23.

The square root of 718421 is about 847.5971920671. The cubic root of 718421 is about 89.5625271793.

The spelling of 718421 in words is "seven hundred eighteen thousand, four hundred twenty-one".