18129858 has 8 divisors (see below), whose sum is σ = 36259728. Its totient is φ = 6043284.

The previous prime is 18129851. The next prime is 18129883. The reversal of 18129858 is 85892181.

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

18129858 is an admirable number.

It is a super-2 number, since 2×18129858² = 657383502200328, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (18129851) 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, 1510816 + ... + 1510827.

It is an arithmetic number, because the mean of its divisors is an integer number (4532466).

Almost surely, 2^18129858 is an apocalyptic number.

18129858 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.

18129858 is a wasteful number, since it uses less digits than its factorization.

18129858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021648.

The product of its digits is 46080, while the sum is 42.

The square root of 18129858 is about 4257.9170964217. The cubic root of 18129858 is about 262.7028599695.

The spelling of 18129858 in words is "eighteen million, one hundred twenty-nine thousand, eight hundred fifty-eight".