42832721 has 2 divisors, whose sum is σ = 42832722. Its totient is φ = 42832720.

The previous prime is 42832697. The next prime is 42832733. The reversal of 42832721 is 12723824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23814400 + 19018321 = 4880^2 + 4361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42832721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42832121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21416360 + 21416361.

It is an arithmetic number, because the mean of its divisors is an integer number (21416361).

Almost surely, 2^42832721 is an apocalyptic number.

It is an amenable number.

42832721 is a deficient number, since it is larger than the sum of its proper divisors (1).

42832721 is an equidigital number, since it uses as much as digits as its factorization.

42832721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 29.

The square root of 42832721 is about 6544.6711911295. The cubic root of 42832721 is about 349.8849172661.

The spelling of 42832721 in words is "forty-two million, eight hundred thirty-two thousand, seven hundred twenty-one".