42220987 has 4 divisors (see below), whose sum is σ = 42377056. Its totient is φ = 42064920.

The previous prime is 42220963. The next prime is 42221027. The reversal of 42220987 is 78902224.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42220987 is a prime.

It is a super-2 number, since 2×42220987² = 3565223486508338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42220957) 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, 77628 + ... + 78169.

It is an arithmetic number, because the mean of its divisors is an integer number (10594264).

Almost surely, 2^42220987 is an apocalyptic number.

42220987 is a deficient number, since it is larger than the sum of its proper divisors (156069).

42220987 is a wasteful number, since it uses less digits than its factorization.

42220987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156068.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 42220987 is about 6497.7678474996. The cubic root of 42220987 is about 348.2112465373.

The spelling of 42220987 in words is "forty-two million, two hundred twenty thousand, nine hundred eighty-seven".