42120987 has 8 divisors (see below), whose sum is σ = 56244240. Its totient is φ = 28039200.

The previous prime is 42120943. The next prime is 42121003. The reversal of 42120987 is 78902124.

It is a happy number.

42120987 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 not a de Polignac number, because 42120987 - 2¹⁰ = 42119963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42120487) 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, 7912 + ... + 12117.

It is an arithmetic number, because the mean of its divisors is an integer number (7030530).

Almost surely, 2^42120987 is an apocalyptic number.

42120987 is a deficient number, since it is larger than the sum of its proper divisors (14123253).

42120987 is a wasteful number, since it uses less digits than its factorization.

42120987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20733.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 42120987 is about 6490.0683355416. The cubic root of 42120987 is about 347.9361175511.

The spelling of 42120987 in words is "forty-two million, one hundred twenty thousand, nine hundred eighty-seven".