42215287 has 8 divisors (see below), whose sum is σ = 42678720. Its totient is φ = 41754720.

The previous prime is 42215269. The next prime is 42215291. The reversal of 42215287 is 78251224.

It is a happy number.

42215287 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 42215287 - 2²³ = 33826679 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 (42215237) 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, 40837 + ... + 41857.

It is an arithmetic number, because the mean of its divisors is an integer number (5334840).

Almost surely, 2^42215287 is an apocalyptic number.

42215287 is a deficient number, since it is larger than the sum of its proper divisors (463433).

42215287 is a wasteful number, since it uses less digits than its factorization.

42215287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433.

The product of its digits is 8960, while the sum is 31.

The square root of 42215287 is about 6497.3292205336. The cubic root of 42215287 is about 348.1955758676.

The spelling of 42215287 in words is "forty-two million, two hundred fifteen thousand, two hundred eighty-seven".