42356987 has 4 divisors (see below), whose sum is σ = 42397680. Its totient is φ = 42316296.

The previous prime is 42356983. The next prime is 42357019. The reversal of 42356987 is 78965324.

42356987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42356987 - 2² = 42356983 is a prime.

It is a super-2 number, since 2×42356987² = 3588228695436338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42356983) 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 3 ways as a sum of consecutive naturals, for example, 18743 + ... + 20880.

It is an arithmetic number, because the mean of its divisors is an integer number (10599420).

Almost surely, 2^42356987 is an apocalyptic number.

42356987 is a deficient number, since it is larger than the sum of its proper divisors (40693).

42356987 is a wasteful number, since it uses less digits than its factorization.

42356987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40692.

The product of its digits is 362880, while the sum is 44.

The square root of 42356987 is about 6508.2245658858. The cubic root of 42356987 is about 348.5847256688.

The spelling of 42356987 in words is "forty-two million, three hundred fifty-six thousand, nine hundred eighty-seven".