18122858 has 8 divisors (see below), whose sum is σ = 29275428. Its totient is φ = 8364384.

The previous prime is 18122851. The next prime is 18122887. The reversal of 18122858 is 85822181.

It can be written as a sum of positive squares in 2 ways, for example, as 18037009 + 85849 = 4247^2 + 293^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18122851) 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, 348491 + ... + 348542.

Almost surely, 2^18122858 is an apocalyptic number.

18122858 is a deficient number, since it is larger than the sum of its proper divisors (11152570).

18122858 is a wasteful number, since it uses less digits than its factorization.

18122858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697048.

The product of its digits is 10240, while the sum is 35.

The square root of 18122858 is about 4257.0950189067. The cubic root of 18122858 is about 262.6690454605.

It can be divided in two parts, 18122 and 858, that multiplied together give a triangular number (15548676 = T₅₅₇₆).

The spelling of 18122858 in words is "eighteen million, one hundred twenty-two thousand, eight hundred fifty-eight".