18748489 has 4 divisors (see below), whose sum is σ = 19066320. Its totient is φ = 18430660.

The previous prime is 18748487. The next prime is 18748507. The reversal of 18748489 is 98484781.

18748489 = T₁₃₂ + T₁₃₃ + ... + T₄₈₅.

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 18748489 - 2¹ = 18748487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18748487) 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, 158827 + ... + 158944.

It is an arithmetic number, because the mean of its divisors is an integer number (4766580).

Almost surely, 2^18748489 is an apocalyptic number.

It is an amenable number.

18748489 is a deficient number, since it is larger than the sum of its proper divisors (317831).

18748489 is an equidigital number, since it uses as much as digits as its factorization.

18748489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317830.

The product of its digits is 516096, while the sum is 49.

The square root of 18748489 is about 4329.9525401556. The cubic root of 18748489 is about 265.6575057613.

The spelling of 18748489 in words is "eighteen million, seven hundred forty-eight thousand, four hundred eighty-nine".