42400513 has 2 divisors, whose sum is σ = 42400514. Its totient is φ = 42400512.

The previous prime is 42400471. The next prime is 42400531. The reversal of 42400513 is 31500424.

Together with next prime (42400531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29953729 + 12446784 = 5473^2 + 3528^2 .

It is a cyclic number.

It is not a de Polignac number, because 42400513 - 2²⁵ = 8846081 is a prime.

It is not a weakly prime, because it can be changed into another prime (42400573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200256 + 21200257.

It is an arithmetic number, because the mean of its divisors is an integer number (21200257).

Almost surely, 2^42400513 is an apocalyptic number.

It is an amenable number.

42400513 is a deficient number, since it is larger than the sum of its proper divisors (1).

42400513 is an equidigital number, since it uses as much as digits as its factorization.

42400513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 42400513 is about 6511.5676299951. The cubic root of 42400513 is about 348.7040865718.

Adding to 42400513 its reverse (31500424), we get a palindrome (73900937).

The spelling of 42400513 in words is "forty-two million, four hundred thousand, five hundred thirteen".