18259429 has 2 divisors, whose sum is σ = 18259430. Its totient is φ = 18259428.

The previous prime is 18259427. The next prime is 18259459. The reversal of 18259429 is 92495281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18258529 + 900 = 4273^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 18259429 - 2¹ = 18259427 is a prime.

Together with 18259427, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18259391 and 18259400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18259421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9129714 + 9129715.

It is an arithmetic number, because the mean of its divisors is an integer number (9129715).

Almost surely, 2^18259429 is an apocalyptic number.

It is an amenable number.

18259429 is a deficient number, since it is larger than the sum of its proper divisors (1).

18259429 is an equidigital number, since it uses as much as digits as its factorization.

18259429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 18259429 is about 4273.1053111291. The cubic root of 18259429 is about 263.3272057895.

The spelling of 18259429 in words is "eighteen million, two hundred fifty-nine thousand, four hundred twenty-nine".