18929749 has 4 divisors (see below), whose sum is σ = 18963936. Its totient is φ = 18895564.

The previous prime is 18929717. The next prime is 18929753. The reversal of 18929749 is 94792981.

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.

It is a cyclic number.

It is not a de Polignac number, because 18929749 - 2⁵ = 18929717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18929549) 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, 16249 + ... + 17374.

It is an arithmetic number, because the mean of its divisors is an integer number (4740984).

Almost surely, 2^18929749 is an apocalyptic number.

It is an amenable number.

18929749 is a deficient number, since it is larger than the sum of its proper divisors (34187).

18929749 is an equidigital number, since it uses as much as digits as its factorization.

18929749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34186.

The product of its digits is 326592, while the sum is 49.

The square root of 18929749 is about 4350.8331386069. The cubic root of 18929749 is about 266.5108852285.

The spelling of 18929749 in words is "eighteen million, nine hundred twenty-nine thousand, seven hundred forty-nine".