42540406 has 8 divisors (see below), whose sum is σ = 64217520. Its totient is φ = 21134568.

The previous prime is 42540403. The next prime is 42540413. The reversal of 42540406 is 60404524.

42540406 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 super-2 number, since 2×42540406² = 3619372285289672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540403) 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 3 ways as a sum of consecutive naturals, for example, 67426 + ... + 68053.

It is an arithmetic number, because the mean of its divisors is an integer number (8027190).

Almost surely, 2^42540406 is an apocalyptic number.

42540406 is a deficient number, since it is larger than the sum of its proper divisors (21677114).

42540406 is a wasteful number, since it uses less digits than its factorization.

42540406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135638.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 42540406 is about 6522.3006677092. The cubic root of 42540406 is about 349.0871614222.

The spelling of 42540406 in words is "forty-two million, five hundred forty thousand, four hundred six".