42540413 has 2 divisors, whose sum is σ = 42540414. Its totient is φ = 42540412.

The previous prime is 42540403. The next prime is 42540437. The reversal of 42540413 is 31404524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40284409 + 2256004 = 6347^2 + 1502^2 .

It is a cyclic number.

It is not a de Polignac number, because 42540413 - 2⁶ = 42540349 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42540403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21270206 + 21270207.

It is an arithmetic number, because the mean of its divisors is an integer number (21270207).

Almost surely, 2^42540413 is an apocalyptic number.

It is an amenable number.

42540413 is a deficient number, since it is larger than the sum of its proper divisors (1).

42540413 is an equidigital number, since it uses as much as digits as its factorization.

42540413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 42540413 is about 6522.3012043296. The cubic root of 42540413 is about 349.0871805696.

Adding to 42540413 its reverse (31404524), we get a palindrome (73944937).

The spelling of 42540413 in words is "forty-two million, five hundred forty thousand, four hundred thirteen".