708421 has 4 divisors (see below), whose sum is σ = 809632. Its totient is φ = 607212.

The previous prime is 708403. The next prime is 708437. The reversal of 708421 is 124807.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124807 = 137 ⋅911.

It is a cyclic number.

It is not a de Polignac number, because 708421 - 2⁷ = 708293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 708392 and 708401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (708481) 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, 50595 + ... + 50608.

It is an arithmetic number, because the mean of its divisors is an integer number (202408).

2⁷⁰⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

708421 is a deficient number, since it is larger than the sum of its proper divisors (101211).

708421 is a wasteful number, since it uses less digits than its factorization.

708421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101210.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 708421 is about 841.6774916796. The cubic root of 708421 is about 89.1450313868.

The spelling of 708421 in words is "seven hundred eight thousand, four hundred twenty-one".