42815215 has 4 divisors (see below), whose sum is σ = 51378264. Its totient is φ = 34252168.

The previous prime is 42815209. The next prime is 42815219. The reversal of 42815215 is 51251824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42815215 - 2³ = 42815207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42815219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4281517 + ... + 4281526.

It is an arithmetic number, because the mean of its divisors is an integer number (12844566).

Almost surely, 2^42815215 is an apocalyptic number.

42815215 is a deficient number, since it is larger than the sum of its proper divisors (8563049).

42815215 is an equidigital number, since it uses as much as digits as its factorization.

42815215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8563048.

The product of its digits is 3200, while the sum is 28.

The square root of 42815215 is about 6543.3336304975. Note that the first 3 decimals coincide. The cubic root of 42815215 is about 349.8372440553.

The spelling of 42815215 in words is "forty-two million, eight hundred fifteen thousand, two hundred fifteen".