18948749 has 4 divisors (see below), whose sum is σ = 18968160. Its totient is φ = 18929340.

The previous prime is 18948733. The next prime is 18948751. The reversal of 18948749 is 94784981.

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: 94784981 = 1033 ⋅91757.

It is a cyclic number.

It is not a de Polignac number, because 18948749 - 2⁴ = 18948733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18948697 and 18948706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18948799) 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, 8159 + ... + 10220.

It is an arithmetic number, because the mean of its divisors is an integer number (4742040).

Almost surely, 2^18948749 is an apocalyptic number.

It is an amenable number.

18948749 is a deficient number, since it is larger than the sum of its proper divisors (19411).

18948749 is a wasteful number, since it uses less digits than its factorization.

18948749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19410.

The product of its digits is 580608, while the sum is 50.

The square root of 18948749 is about 4353.0160808341. The cubic root of 18948749 is about 266.6000220610.

The spelling of 18948749 in words is "eighteen million, nine hundred forty-eight thousand, seven hundred forty-nine".