18372811 has 4 divisors (see below), whose sum is σ = 18466272. Its totient is φ = 18279352.

The previous prime is 18372799. The next prime is 18372841. The reversal of 18372811 is 11827381.

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: 11827381 = 227 ⋅52103.

It is a cyclic number.

It is not a de Polignac number, because 18372811 - 2¹¹ = 18370763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18372841) 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, 46435 + ... + 46828.

It is an arithmetic number, because the mean of its divisors is an integer number (4616568).

Almost surely, 2^18372811 is an apocalyptic number.

18372811 is a deficient number, since it is larger than the sum of its proper divisors (93461).

18372811 is an equidigital number, since it uses as much as digits as its factorization.

18372811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93460.

The product of its digits is 2688, while the sum is 31.

The square root of 18372811 is about 4286.3517121207. The cubic root of 18372811 is about 263.8711253064.

The spelling of 18372811 in words is "eighteen million, three hundred seventy-two thousand, eight hundred eleven".