18725849 has 4 divisors (see below), whose sum is σ = 19711440. Its totient is φ = 17740260.

The previous prime is 18725821. The next prime is 18725893. The reversal of 18725849 is 94852781.

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 18725849 - 2⁸ = 18725593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18725809) 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, 492767 + ... + 492804.

It is an arithmetic number, because the mean of its divisors is an integer number (4927860).

Almost surely, 2^18725849 is an apocalyptic number.

18725849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18725849 is a deficient number, since it is larger than the sum of its proper divisors (985591).

18725849 is an equidigital number, since it uses as much as digits as its factorization.

18725849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985590.

The product of its digits is 161280, while the sum is 44.

The square root of 18725849 is about 4327.3374030690. The cubic root of 18725849 is about 265.5505298780.

The spelling of 18725849 in words is "eighteen million, seven hundred twenty-five thousand, eight hundred forty-nine".