57042947 has 4 divisors (see below), whose sum is σ = 61430880. Its totient is φ = 52655016.

The previous prime is 57042919. The next prime is 57043001. The reversal of 57042947 is 74924075.

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 57042947 - 2¹² = 57038851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57042947.

It is not an unprimeable number, because it can be changed into a prime (57042917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2193947 + ... + 2193972.

It is an arithmetic number, because the mean of its divisors is an integer number (15357720).

Almost surely, 2^57042947 is an apocalyptic number.

57042947 is a deficient number, since it is larger than the sum of its proper divisors (4387933).

57042947 is a wasteful number, since it uses less digits than its factorization.

57042947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4387932.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 57042947 is about 7552.6781342779. The cubic root of 57042947 is about 384.9467447561.

The spelling of 57042947 in words is "fifty-seven million, forty-two thousand, nine hundred forty-seven".