42215987 has 8 divisors (see below), whose sum is σ = 46127280. Its totient is φ = 38316960.

The previous prime is 42215977. The next prime is 42215989. The reversal of 42215987 is 78951224.

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

It is not a de Polignac number, because 42215987 - 2⁶ = 42215923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42215987.

It is not an unprimeable number, because it can be changed into a prime (42215989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5093 + ... + 10505.

It is an arithmetic number, because the mean of its divisors is an integer number (5765910).

Almost surely, 2^42215987 is an apocalyptic number.

42215987 is a deficient number, since it is larger than the sum of its proper divisors (3911293).

42215987 is a wasteful number, since it uses less digits than its factorization.

42215987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6133.

The product of its digits is 40320, while the sum is 38.

The square root of 42215987 is about 6497.3830885981. The cubic root of 42215987 is about 348.1975004118.

The spelling of 42215987 in words is "forty-two million, two hundred fifteen thousand, nine hundred eighty-seven".