18700361 has 4 divisors (see below), whose sum is σ = 19053252. Its totient is φ = 18347472.

The previous prime is 18700333. The next prime is 18700373. The reversal of 18700361 is 16300781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17272336 + 1428025 = 4156^2 + 1195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18700361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18700361.

It is not an unprimeable number, because it can be changed into a prime (18700301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176366 + ... + 176471.

It is an arithmetic number, because the mean of its divisors is an integer number (4763313).

Almost surely, 2^18700361 is an apocalyptic number.

It is an amenable number.

18700361 is a deficient number, since it is larger than the sum of its proper divisors (352891).

18700361 is an equidigital number, since it uses as much as digits as its factorization.

18700361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352890.

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

The square root of 18700361 is about 4324.3914022669. The cubic root of 18700361 is about 265.4299937310.

The spelling of 18700361 in words is "eighteen million, seven hundred thousand, three hundred sixty-one".