18706363 has 16 divisors (see below), whose sum is σ = 21218400. Its totient is φ = 16389408.

The previous prime is 18706351. The next prime is 18706367. The reversal of 18706363 is 36360781.

It is a de Polignac number, because none of the positive numbers 2^k-18706363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18706367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317028 + ... + 317086.

It is an arithmetic number, because the mean of its divisors is an integer number (1326150).

Almost surely, 2^18706363 is an apocalyptic number.

18706363 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18706363 is a deficient number, since it is larger than the sum of its proper divisors (2512037).

18706363 is an frugal number, since it uses more digits than its factorization.

18706363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 18706363 is about 4325.0853170776. The cubic root of 18706363 is about 265.4583878426.

The spelling of 18706363 in words is "eighteen million, seven hundred six thousand, three hundred sixty-three".