42328729 has 2 divisors, whose sum is σ = 42328730. Its totient is φ = 42328728.

The previous prime is 42328721. The next prime is 42328747. The reversal of 42328729 is 92782324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31753225 + 10575504 = 5635^2 + 3252^2 .

It is a cyclic number.

It is not a de Polignac number, because 42328729 - 2³ = 42328721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42328721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21164364 + 21164365.

It is an arithmetic number, because the mean of its divisors is an integer number (21164365).

Almost surely, 2^42328729 is an apocalyptic number.

It is an amenable number.

42328729 is a deficient number, since it is larger than the sum of its proper divisors (1).

42328729 is an equidigital number, since it uses as much as digits as its factorization.

42328729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 42328729 is about 6506.0532583126. The cubic root of 42328729 is about 348.5071902632.

The spelling of 42328729 in words is "forty-two million, three hundred twenty-eight thousand, seven hundred twenty-nine".