8721858 has 8 divisors (see below), whose sum is σ = 17443728. Its totient is φ = 2907284.

The previous prime is 8721851. The next prime is 8721877. The reversal of 8721858 is 8581278.

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

8721858 is an admirable number.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (8721851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726816 + ... + 726827.

It is an arithmetic number, because the mean of its divisors is an integer number (2180466).

Almost surely, 2^8721858 is an apocalyptic number.

8721858 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8721858 is a wasteful number, since it uses less digits than its factorization.

8721858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453648.

The product of its digits is 35840, while the sum is 39.

The square root of 8721858 is about 2953.2791943871. The cubic root of 8721858 is about 205.8431111347.

It can be divided in two parts, 87 and 21858, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 8721858 in words is "eight million, seven hundred twenty-one thousand, eight hundred fifty-eight".