18972029 has 2 divisors, whose sum is σ = 18972030. Its totient is φ = 18972028.

The previous prime is 18972001. The next prime is 18972047. The reversal of 18972029 is 92027981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11546404 + 7425625 = 3398^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 18972029 - 2¹² = 18967933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18971983 and 18972001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18972229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9486014 + 9486015.

It is an arithmetic number, because the mean of its divisors is an integer number (9486015).

Almost surely, 2^18972029 is an apocalyptic number.

It is an amenable number.

18972029 is a deficient number, since it is larger than the sum of its proper divisors (1).

18972029 is an equidigital number, since it uses as much as digits as its factorization.

18972029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 18972029 is about 4355.6892680723. The cubic root of 18972029 is about 266.7091569446.

The spelling of 18972029 in words is "eighteen million, nine hundred seventy-two thousand, twenty-nine".