42056387 has 4 divisors (see below), whose sum is σ = 42490056. Its totient is φ = 41622720.

The previous prime is 42056381. The next prime is 42056393. The reversal of 42056387 is 78365024.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (42056381) and next prime (42056393).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42056387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42056381) 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, 216689 + ... + 216882.

It is an arithmetic number, because the mean of its divisors is an integer number (10622514).

Almost surely, 2^42056387 is an apocalyptic number.

42056387 is a deficient number, since it is larger than the sum of its proper divisors (433669).

42056387 is an equidigital number, since it uses as much as digits as its factorization.

42056387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433668.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 42056387 is about 6485.0895907458. The cubic root of 42056387 is about 347.7581526358.

The spelling of 42056387 in words is "forty-two million, fifty-six thousand, three hundred eighty-seven".