18106730 has 24 divisors (see below), whose sum is σ = 33770412. Its totient is φ = 6989696.

The previous prime is 18106667. The next prime is 18106733. The reversal of 18106730 is 3760181.

It can be written as a sum of positive squares in 6 ways, for example, as 3916441 + 14190289 = 1979^2 + 3767^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18106730.

It is not an unprimeable number, because it can be changed into a prime (18106733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7334 + ... + 9486.

Almost surely, 2^18106730 is an apocalyptic number.

18106730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18106730 is a deficient number, since it is larger than the sum of its proper divisors (15663682).

18106730 is a wasteful number, since it uses less digits than its factorization.

18106730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218 (or 2189 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 18106730 is about 4255.2003478097. The cubic root of 18106730 is about 262.5911036763.

The spelling of 18106730 in words is "eighteen million, one hundred six thousand, seven hundred thirty".