18906361 has 4 divisors (see below), whose sum is σ = 19308672. Its totient is φ = 18504052.

The previous prime is 18906353. The next prime is 18906383. The reversal of 18906361 is 16360981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18906361 - 2³ = 18906353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18906301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201085 + ... + 201178.

It is an arithmetic number, because the mean of its divisors is an integer number (4827168).

Almost surely, 2^18906361 is an apocalyptic number.

It is an amenable number.

18906361 is a deficient number, since it is larger than the sum of its proper divisors (402311).

18906361 is an equidigital number, since it uses as much as digits as its factorization.

18906361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402310.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 18906361 is about 4348.1445468153. The cubic root of 18906361 is about 266.4010805431.

The spelling of 18906361 in words is "eighteen million, nine hundred six thousand, three hundred sixty-one".