42556947 has 4 divisors (see below), whose sum is σ = 56742600. Its totient is φ = 28371296.

The previous prime is 42556939. The next prime is 42556957. The reversal of 42556947 is 74965524.

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 42556947 - 2³ = 42556939 is a prime.

It is a super-2 number, since 2×42556947² = 3622187475921618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42556899 and 42556908.

It is not an unprimeable number, because it can be changed into a prime (42556957) 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, 7092822 + ... + 7092827.

It is an arithmetic number, because the mean of its divisors is an integer number (14185650).

Almost surely, 2^42556947 is an apocalyptic number.

42556947 is a deficient number, since it is larger than the sum of its proper divisors (14185653).

42556947 is a wasteful number, since it uses less digits than its factorization.

42556947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14185652.

The product of its digits is 302400, while the sum is 42.

The square root of 42556947 is about 6523.5685786232. The cubic root of 42556947 is about 349.1324007843.

The spelling of 42556947 in words is "forty-two million, five hundred fifty-six thousand, nine hundred forty-seven".