8708421 has 16 divisors (see below), whose sum is σ = 12320640. Its totient is φ = 5459520.

The previous prime is 8708411. The next prime is 8708423. The reversal of 8708421 is 1248078.

It is a de Polignac number, because none of the positive numbers 2^k-8708421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8708423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3175 + ... + 5243.

It is an arithmetic number, because the mean of its divisors is an integer number (770040).

Almost surely, 2^8708421 is an apocalyptic number.

It is an amenable number.

8708421 is a deficient number, since it is larger than the sum of its proper divisors (3612219).

8708421 is a wasteful number, since it uses less digits than its factorization.

8708421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 8708421 is about 2951.0033886799. The cubic root of 8708421 is about 205.7373486736.

The spelling of 8708421 in words is "eight million, seven hundred eight thousand, four hundred twenty-one".