42120187 has 4 divisors (see below), whose sum is σ = 42212016. Its totient is φ = 42028360.

The previous prime is 42120179. The next prime is 42120191. The reversal of 42120187 is 78102124.

It is a happy number.

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 42120187 - 2³ = 42120179 is a prime.

It is a super-2 number, since 2×42120187² = 3548220305829938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42120157) 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, 45223 + ... + 46144.

It is an arithmetic number, because the mean of its divisors is an integer number (10553004).

Almost surely, 2^42120187 is an apocalyptic number.

42120187 is a deficient number, since it is larger than the sum of its proper divisors (91829).

42120187 is an equidigital number, since it uses as much as digits as its factorization.

42120187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91828.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 42120187 is about 6490.0067026160. The cubic root of 42120187 is about 347.9339147644.

The spelling of 42120187 in words is "forty-two million, one hundred twenty thousand, one hundred eighty-seven".