18374813 has 4 divisors (see below), whose sum is σ = 18434208. Its totient is φ = 18315420.

The previous prime is 18374771. The next prime is 18374821. The reversal of 18374813 is 31847381.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31847381 = 1091 ⋅29191.

It is a cyclic number.

It is not a de Polignac number, because 18374813 - 2⁸ = 18374557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18374833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29231 + ... + 29852.

It is an arithmetic number, because the mean of its divisors is an integer number (4608552).

Almost surely, 2^18374813 is an apocalyptic number.

It is an amenable number.

18374813 is a deficient number, since it is larger than the sum of its proper divisors (59395).

18374813 is an equidigital number, since it uses as much as digits as its factorization.

18374813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59394.

The product of its digits is 16128, while the sum is 35.

The square root of 18374813 is about 4286.5852376921. The cubic root of 18374813 is about 263.8807092292.

The spelling of 18374813 in words is "eighteen million, three hundred seventy-four thousand, eight hundred thirteen".