18429973 has 2 divisors, whose sum is σ = 18429974. Its totient is φ = 18429972.

The previous prime is 18429907. The next prime is 18429977. The reversal of 18429973 is 37992481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13380964 + 5049009 = 3658^2 + 2247^2 .

It is a cyclic number.

It is not a de Polignac number, because 18429973 - 2⁹ = 18429461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18429977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214986 + 9214987.

It is an arithmetic number, because the mean of its divisors is an integer number (9214987).

Almost surely, 2^18429973 is an apocalyptic number.

It is an amenable number.

18429973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18429973 is an equidigital number, since it uses as much as digits as its factorization.

18429973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 18429973 is about 4293.0144420908. The cubic root of 18429973 is about 264.1444963874.

The spelling of 18429973 in words is "eighteen million, four hundred twenty-nine thousand, nine hundred seventy-three".