42724039 has 2 divisors, whose sum is σ = 42724040. Its totient is φ = 42724038.

The previous prime is 42724007. The next prime is 42724049. The reversal of 42724039 is 93042724.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42724039 - 2⁵ = 42724007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42724039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42724049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21362019 + 21362020.

It is an arithmetic number, because the mean of its divisors is an integer number (21362020).

Almost surely, 2^42724039 is an apocalyptic number.

42724039 is a deficient number, since it is larger than the sum of its proper divisors (1).

42724039 is an equidigital number, since it uses as much as digits as its factorization.

42724039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 42724039 is about 6536.3628265267. The cubic root of 42724039 is about 349.5887387127.

The spelling of 42724039 in words is "forty-two million, seven hundred twenty-four thousand, thirty-nine".