18320711 has 4 divisors (see below), whose sum is σ = 18433272. Its totient is φ = 18208152.

The previous prime is 18320677. The next prime is 18320723. The reversal of 18320711 is 11702381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11702381 = 2459 ⋅4759.

It is a cyclic number.

It is not a de Polignac number, because 18320711 - 2¹⁰ = 18319687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18320761) 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, 56036 + ... + 56361.

It is an arithmetic number, because the mean of its divisors is an integer number (4608318).

Almost surely, 2^18320711 is an apocalyptic number.

18320711 is a deficient number, since it is larger than the sum of its proper divisors (112561).

18320711 is a wasteful number, since it uses less digits than its factorization.

18320711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112560.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 18320711 is about 4280.2699681212. The cubic root of 18320711 is about 263.6214683365.

The spelling of 18320711 in words is "eighteen million, three hundred twenty thousand, seven hundred eleven".