18429689 has 2 divisors, whose sum is σ = 18429690. Its totient is φ = 18429688.

The previous prime is 18429679. The next prime is 18429707. The reversal of 18429689 is 98692481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13935289 + 4494400 = 3733^2 + 2120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18429689 is a prime.

It is not a weakly prime, because it can be changed into another prime (18429629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214844 + 9214845.

It is an arithmetic number, because the mean of its divisors is an integer number (9214845).

Almost surely, 2^18429689 is an apocalyptic number.

It is an amenable number.

18429689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18429689 is an equidigital number, since it uses as much as digits as its factorization.

18429689 is an evil number, because the sum of its binary digits is even.

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

The square root of 18429689 is about 4292.9813649724. The cubic root of 18429689 is about 264.1431395863.

The spelling of 18429689 in words is "eighteen million, four hundred twenty-nine thousand, six hundred eighty-nine".