8181858 has 16 divisors (see below), whose sum is σ = 16396416. Its totient is φ = 2721840.

The previous prime is 8181851. The next prime is 8181871. The reversal of 8181858 is 8581818.

8181858 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181851) 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, 2935 + ... + 4997.

It is an arithmetic number, because the mean of its divisors is an integer number (1024776).

Almost surely, 2^8181858 is an apocalyptic number.

8181858 is an abundant number, since it is smaller than the sum of its proper divisors (8214558).

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

8181858 is a wasteful number, since it uses less digits than its factorization.

8181858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729.

The product of its digits is 20480, while the sum is 39.

The square root of 8181858 is about 2860.3947280052. The cubic root of 8181858 is about 201.5041427476.

The spelling of 8181858 in words is "eight million, one hundred eighty-one thousand, eight hundred fifty-eight".