42540215 has 8 divisors (see below), whose sum is σ = 52695168. Its totient is φ = 32934240.

The previous prime is 42540191. The next prime is 42540227. The reversal of 42540215 is 51204524.

It is a happy number.

42540215 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 not a de Polignac number, because 42540215 - 2¹⁰ = 42539191 is a prime.

It is a super-3 number, since 3×42540215³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 137072 + ... + 137381.

It is an arithmetic number, because the mean of its divisors is an integer number (6586896).

Almost surely, 2^42540215 is an apocalyptic number.

42540215 is a deficient number, since it is larger than the sum of its proper divisors (10154953).

42540215 is a wasteful number, since it uses less digits than its factorization.

42540215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274489.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 42540215 is about 6522.2860256202. The cubic root of 42540215 is about 349.0866389719.

Adding to 42540215 its reverse (51204524), we get a palindrome (93744739).

The spelling of 42540215 in words is "forty-two million, five hundred forty thousand, two hundred fifteen".