717421 has 8 divisors (see below), whose sum is σ = 768800. Its totient is φ = 667440.

The previous prime is 717419. The next prime is 717427. The reversal of 717421 is 124717.

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 717421 - 2¹ = 717419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 717392 and 717401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (717427) 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, 850 + ... + 1468.

It is an arithmetic number, because the mean of its divisors is an integer number (96100).

2⁷¹⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

717421 is a deficient number, since it is larger than the sum of its proper divisors (51379).

717421 is a wasteful number, since it uses less digits than its factorization.

717421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699.

The product of its digits is 392, while the sum is 22.

The square root of 717421 is about 847.0070837956. The cubic root of 717421 is about 89.5209526176.

Subtracting from 717421 its reverse (124717), we obtain a cube (592704 = 84³).

The spelling of 717421 in words is "seven hundred seventeen thousand, four hundred twenty-one", and thus it is an iban number.