42540403 has 2 divisors, whose sum is σ = 42540404. Its totient is φ = 42540402.

The previous prime is 42540391. The next prime is 42540413. The reversal of 42540403 is 30404524.

It is a happy number.

42540403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42540403 - 2⁵ = 42540371 is a prime.

It is a super-3 number, since 3×42540403³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (42540413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21270201 + 21270202.

It is an arithmetic number, because the mean of its divisors is an integer number (21270202).

Almost surely, 2^42540403 is an apocalyptic number.

42540403 is a deficient number, since it is larger than the sum of its proper divisors (1).

42540403 is an equidigital number, since it uses as much as digits as its factorization.

42540403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 42540403 is about 6522.3004377290. The cubic root of 42540403 is about 349.0871532162.

Adding to 42540403 its reverse (30404524), we get a palindrome (72944927).

The spelling of 42540403 in words is "forty-two million, five hundred forty thousand, four hundred three".