42215985 has 40 divisors (see below), whose sum is σ = 86492736. Its totient is φ = 19297440.

The previous prime is 42215977. The next prime is 42215989. The reversal of 42215985 is 58951224.

42215985 is a `hidden beast` number, since 42 + 21 + 598 + 5 = 666.

It is not a de Polignac number, because 42215985 - 2³ = 42215977 is a prime.

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 39 ways as a sum of consecutive naturals, for example, 4611 + ... + 10280.

Almost surely, 2^42215985 is an apocalyptic number.

42215985 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42215985 is an abundant number, since it is smaller than the sum of its proper divisors (44276751).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42215985 is a wasteful number, since it uses less digits than its factorization.

42215985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14915 (or 14906 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 42215985 is about 6497.3829346899. The cubic root of 42215985 is about 348.1974949131.

The spelling of 42215985 in words is "forty-two million, two hundred fifteen thousand, nine hundred eighty-five".