42056047 has 4 divisors (see below), whose sum is σ = 45879336. Its totient is φ = 38232760.

The previous prime is 42056041. The next prime is 42056059. The reversal of 42056047 is 74065024.

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 42056047 - 2⁷ = 42055919 is a prime.

It is a super-2 number, since 2×42056047² = 3537422178532418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42056041) 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, 1911628 + ... + 1911649.

It is an arithmetic number, because the mean of its divisors is an integer number (11469834).

Almost surely, 2^42056047 is an apocalyptic number.

42056047 is a deficient number, since it is larger than the sum of its proper divisors (3823289).

42056047 is a wasteful number, since it uses less digits than its factorization.

42056047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823288.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 42056047 is about 6485.0633767142. The cubic root of 42056047 is about 347.7572154964.

The spelling of 42056047 in words is "forty-two million, fifty-six thousand, forty-seven".