42240013 has 2 divisors, whose sum is σ = 42240014. Its totient is φ = 42240012.

The previous prime is 42239971. The next prime is 42240017. The reversal of 42240013 is 31004224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32114889 + 10125124 = 5667^2 + 3182^2 .

It is a cyclic number.

It is not a de Polignac number, because 42240013 - 2¹³ = 42231821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42240017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21120006 + 21120007.

It is an arithmetic number, because the mean of its divisors is an integer number (21120007).

Almost surely, 2^42240013 is an apocalyptic number.

It is an amenable number.

42240013 is a deficient number, since it is larger than the sum of its proper divisors (1).

42240013 is an equidigital number, since it uses as much as digits as its factorization.

42240013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 42240013 is about 6499.2317238271. The cubic root of 42240013 is about 348.2635433747.

Adding to 42240013 its reverse (31004224), we get a palindrome (73244237).

The spelling of 42240013 in words is "forty-two million, two hundred forty thousand, thirteen".