18749019 has 4 divisors (see below), whose sum is σ = 24998696. Its totient is φ = 12499344.

The previous prime is 18749009. The next prime is 18749057. The reversal of 18749019 is 91094781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91094781 = 3 ⋅30364927.

It is not a de Polignac number, because 18749019 - 2⁹ = 18748507 is a prime.

It is a super-2 number, since 2×18749019² = 703051426924722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18749009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3124834 + ... + 3124839.

It is an arithmetic number, because the mean of its divisors is an integer number (6249674).

Almost surely, 2^18749019 is an apocalyptic number.

18749019 is a deficient number, since it is larger than the sum of its proper divisors (6249677).

18749019 is an equidigital number, since it uses as much as digits as its factorization.

18749019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6249676.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 18749019 is about 4330.0137413177. The cubic root of 18749019 is about 265.6600090235.

The spelling of 18749019 in words is "eighteen million, seven hundred forty-nine thousand, nineteen".