18713489 has 2 divisors, whose sum is σ = 18713490. Its totient is φ = 18713488.

The previous prime is 18713459. The next prime is 18713501. The reversal of 18713489 is 98431781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15272464 + 3441025 = 3908^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 18713489 - 2¹² = 18709393 is a prime.

It is not a weakly prime, because it can be changed into another prime (18713449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9356744 + 9356745.

It is an arithmetic number, because the mean of its divisors is an integer number (9356745).

Almost surely, 2^18713489 is an apocalyptic number.

It is an amenable number.

18713489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18713489 is an equidigital number, since it uses as much as digits as its factorization.

18713489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 18713489 is about 4325.9090374163. The cubic root of 18713489 is about 265.4920914603.

The spelling of 18713489 in words is "eighteen million, seven hundred thirteen thousand, four hundred eighty-nine".