18479729 has 2 divisors, whose sum is σ = 18479730. Its totient is φ = 18479728.

The previous prime is 18479707. The next prime is 18479743. The reversal of 18479729 is 92797481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11404129 + 7075600 = 3377^2 + 2660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18479729 is a prime.

It is not a weakly prime, because it can be changed into another prime (18479429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9239864 + 9239865.

It is an arithmetic number, because the mean of its divisors is an integer number (9239865).

Almost surely, 2^18479729 is an apocalyptic number.

It is an amenable number.

18479729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18479729 is an equidigital number, since it uses as much as digits as its factorization.

18479729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 47.

The square root of 18479729 is about 4298.8055317728. The cubic root of 18479729 is about 264.3819893008.

The spelling of 18479729 in words is "eighteen million, four hundred seventy-nine thousand, seven hundred twenty-nine".