18700145 has 8 divisors (see below), whose sum is σ = 22672104. Its totient is φ = 14805504.

The previous prime is 18700117. The next prime is 18700163. The reversal of 18700145 is 54100781.

It can be written as a sum of positive squares in 4 ways, for example, as 790321 + 17909824 = 889^2 + 4232^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18700145 - 2¹² = 18696049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18794 + ... + 19763.

It is an arithmetic number, because the mean of its divisors is an integer number (2834013).

Almost surely, 2^18700145 is an apocalyptic number.

It is an amenable number.

18700145 is a deficient number, since it is larger than the sum of its proper divisors (3971959).

18700145 is an equidigital number, since it uses as much as digits as its factorization.

18700145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38659.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 18700145 is about 4324.3664275822. The cubic root of 18700145 is about 265.4289717704.

The spelling of 18700145 in words is "eighteen million, seven hundred thousand, one hundred forty-five".