18238472029 has 2 divisors, whose sum is σ = 18238472030. Its totient is φ = 18238472028.

The previous prime is 18238472023. The next prime is 18238472053. The reversal of 18238472029 is 92027483281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15605755929 + 2632716100 = 124923^2 + 51310^2 .

It is a cyclic number.

It is not a de Polignac number, because 18238472029 - 2⁵ = 18238471997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18238472029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18238472023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9119236014 + 9119236015.

It is an arithmetic number, because the mean of its divisors is an integer number (9119236015).

Almost surely, 2^18238472029 is an apocalyptic number.

It is an amenable number.

18238472029 is a deficient number, since it is larger than the sum of its proper divisors (1).

18238472029 is an equidigital number, since it uses as much as digits as its factorization.

18238472029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 18238472029 in words is "eighteen billion, two hundred thirty-eight million, four hundred seventy-two thousand, twenty-nine".