105218138 has 8 divisors (see below), whose sum is σ = 158886900. Its totient is φ = 52255840.

The previous prime is 105218137. The next prime is 105218149. The reversal of 105218138 is 831812501.

It can be written as a sum of positive squares in 2 ways, for example, as 103164649 + 2053489 = 10157^2 + 1433^2 .

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

It is a super-2 number, since 2×105218138² = 22141713128374088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 105218138.

It is not an unprimeable number, because it can be changed into a prime (105218137) 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, 176243 + ... + 176838.

Almost surely, 2^105218138 is an apocalyptic number.

105218138 is a deficient number, since it is larger than the sum of its proper divisors (53668762).

105218138 is a wasteful number, since it uses less digits than its factorization.

105218138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353232.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 105218138 is about 10257.5892879370. The cubic root of 105218138 is about 472.0958731084.

The spelling of 105218138 in words is "one hundred five million, two hundred eighteen thousand, one hundred thirty-eight".