42724013 has 4 divisors (see below), whose sum is σ = 43031520. Its totient is φ = 42416508.

The previous prime is 42724007. The next prime is 42724039. The reversal of 42724013 is 31042724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42724013 - 2¹² = 42719917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42724013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42723013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153545 + ... + 153822.

It is an arithmetic number, because the mean of its divisors is an integer number (10757880).

Almost surely, 2^42724013 is an apocalyptic number.

It is an amenable number.

42724013 is a deficient number, since it is larger than the sum of its proper divisors (307507).

42724013 is a wasteful number, since it uses less digits than its factorization.

42724013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307506.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 42724013 is about 6536.3608376527. The cubic root of 42724013 is about 349.5886677978.

Adding to 42724013 its reverse (31042724), we get a palindrome (73766737).

The spelling of 42724013 in words is "forty-two million, seven hundred twenty-four thousand, thirteen".