42540431 has 8 divisors (see below), whose sum is σ = 43265664. Its totient is φ = 41818840.

The previous prime is 42540413. The next prime is 42540437. The reversal of 42540431 is 13404524.

42540431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42540431 - 2¹⁰ = 42539407 is a prime.

It is a super-2 number, since 2×42540431² = 3619376539331522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42540397 and 42540406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540437) 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 in 7 ways as a sum of consecutive naturals, for example, 32516 + ... + 33798.

It is an arithmetic number, because the mean of its divisors is an integer number (5408208).

Almost surely, 2^42540431 is an apocalyptic number.

42540431 is a deficient number, since it is larger than the sum of its proper divisors (725233).

42540431 is a wasteful number, since it uses less digits than its factorization.

42540431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821.

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

The square root of 42540431 is about 6522.3025842106. The cubic root of 42540431 is about 349.0872298056.

Adding to 42540431 its reverse (13404524), we get a palindrome (55944955).

The spelling of 42540431 in words is "forty-two million, five hundred forty thousand, four hundred thirty-one".