42718729 has 2 divisors, whose sum is σ = 42718730. Its totient is φ = 42718728.

The previous prime is 42718721. The next prime is 42718759. The reversal of 42718729 is 92781724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34539129 + 8179600 = 5877^2 + 2860^2 .

It is a cyclic number.

It is not a de Polignac number, because 42718729 - 2³ = 42718721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42718691 and 42718700.

It is not a weakly prime, because it can be changed into another prime (42718721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21359364 + 21359365.

It is an arithmetic number, because the mean of its divisors is an integer number (21359365).

Almost surely, 2^42718729 is an apocalyptic number.

It is an amenable number.

42718729 is a deficient number, since it is larger than the sum of its proper divisors (1).

42718729 is an equidigital number, since it uses as much as digits as its factorization.

42718729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 42718729 is about 6535.9566247031. The cubic root of 42718729 is about 349.5742551171.

The spelling of 42718729 in words is "forty-two million, seven hundred eighteen thousand, seven hundred twenty-nine".