18948113 has 4 divisors (see below), whose sum is σ = 19771968. Its totient is φ = 18124260.

The previous prime is 18948089. The next prime is 18948121. The reversal of 18948113 is 31184981.

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: 31184981 = 59 ⋅528559.

It is a cyclic number.

It is not a de Polignac number, because 18948113 - 2⁸ = 18947857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18948133) 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, 411893 + ... + 411938.

It is an arithmetic number, because the mean of its divisors is an integer number (4942992).

Almost surely, 2^18948113 is an apocalyptic number.

It is an amenable number.

18948113 is a deficient number, since it is larger than the sum of its proper divisors (823855).

18948113 is an equidigital number, since it uses as much as digits as its factorization.

18948113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823854.

The product of its digits is 6912, while the sum is 35.

The square root of 18948113 is about 4352.9430274241. The cubic root of 18948113 is about 266.5970392870.

The spelling of 18948113 in words is "eighteen million, nine hundred forty-eight thousand, one hundred thirteen".