42729641 has 2 divisors, whose sum is σ = 42729642. Its totient is φ = 42729640.

The previous prime is 42729593. The next prime is 42729683. The reversal of 42729641 is 14692724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31866025 + 10863616 = 5645^2 + 3296^2 .

It is a cyclic number.

It is not a de Polignac number, because 42729641 - 2¹⁰ = 42728617 is a prime.

It is not a weakly prime, because it can be changed into another prime (42729941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21364820 + 21364821.

It is an arithmetic number, because the mean of its divisors is an integer number (21364821).

Almost surely, 2^42729641 is an apocalyptic number.

It is an amenable number.

42729641 is a deficient number, since it is larger than the sum of its proper divisors (1).

42729641 is an equidigital number, since it uses as much as digits as its factorization.

42729641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 42729641 is about 6536.7913382638. The cubic root of 42729641 is about 349.6040174689.

The spelling of 42729641 in words is "forty-two million, seven hundred twenty-nine thousand, six hundred forty-one".