18823489 has 2 divisors, whose sum is σ = 18823490. Its totient is φ = 18823488.

The previous prime is 18823477. The next prime is 18823501. The reversal of 18823489 is 98432881.

It is a balanced prime because it is at equal distance from previous prime (18823477) and next prime (18823501).

It can be written as a sum of positive squares in only one way, i.e., 17783089 + 1040400 = 4217^2 + 1020^2 .

It is an emirp because it is prime and its reverse (98432881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18823489 - 2¹⁵ = 18790721 is a prime.

It is not a weakly prime, because it can be changed into another prime (18823439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9411744 + 9411745.

It is an arithmetic number, because the mean of its divisors is an integer number (9411745).

Almost surely, 2^18823489 is an apocalyptic number.

It is an amenable number.

18823489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18823489 is an equidigital number, since it uses as much as digits as its factorization.

18823489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 43.

The square root of 18823489 is about 4338.6044991449. The cubic root of 18823489 is about 266.0112730067.

The spelling of 18823489 in words is "eighteen million, eight hundred twenty-three thousand, four hundred eighty-nine".