18948417 has 4 divisors (see below), whose sum is σ = 25264560. Its totient is φ = 12632276.

The previous prime is 18948407. The next prime is 18948431. The reversal of 18948417 is 71484981.

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: 71484981 = 3 ⋅23828327.

It is a cyclic number.

It is not a de Polignac number, because 18948417 - 2⁷ = 18948289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18948407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3158067 + ... + 3158072.

It is an arithmetic number, because the mean of its divisors is an integer number (6316140).

Almost surely, 2^18948417 is an apocalyptic number.

It is an amenable number.

18948417 is a deficient number, since it is larger than the sum of its proper divisors (6316143).

18948417 is an equidigital number, since it uses as much as digits as its factorization.

18948417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316142.

The product of its digits is 64512, while the sum is 42.

The square root of 18948417 is about 4352.9779461881. The cubic root of 18948417 is about 266.5984650238.

The spelling of 18948417 in words is "eighteen million, nine hundred forty-eight thousand, four hundred seventeen".