716421 has 8 divisors (see below), whose sum is σ = 975744. Its totient is φ = 467360.

The previous prime is 716413. The next prime is 716447. The reversal of 716421 is 124617.

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 716421 - 2³ = 716413 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (716411) 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 7 ways as a sum of consecutive naturals, for example, 2400 + ... + 2681.

It is an arithmetic number, because the mean of its divisors is an integer number (121968).

2⁷¹⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

716421 is a deficient number, since it is larger than the sum of its proper divisors (259323).

716421 is a wasteful number, since it uses less digits than its factorization.

716421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5131.

The product of its digits is 336, while the sum is 21.

The square root of 716421 is about 846.4165641101. The cubic root of 716421 is about 89.4793394046.

The spelling of 716421 in words is "seven hundred sixteen thousand, four hundred twenty-one".