18629489 has 2 divisors, whose sum is σ = 18629490. Its totient is φ = 18629488.

The previous prime is 18629473. The next prime is 18629491. The reversal of 18629489 is 98492681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17783089 + 846400 = 4217^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 18629489 - 2⁴ = 18629473 is a prime.

It is a super-2 number, since 2×18629489² = 694115720802242, which contains 22 as substring.

Together with 18629491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18629189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9314744 + 9314745.

It is an arithmetic number, because the mean of its divisors is an integer number (9314745).

Almost surely, 2^18629489 is an apocalyptic number.

It is an amenable number.

18629489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18629489 is an equidigital number, since it uses as much as digits as its factorization.

18629489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 18629489 is about 4316.1891756502. The cubic root of 18629489 is about 265.0942538818.

The spelling of 18629489 in words is "eighteen million, six hundred twenty-nine thousand, four hundred eighty-nine".