42784057 has 4 divisors (see below), whose sum is σ = 43184016. Its totient is φ = 42384100.

The previous prime is 42784039. The next prime is 42784069. The reversal of 42784057 is 75048724.

42784057 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42784057 - 2¹⁹ = 42259769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42782057) 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, 199819 + ... + 200032.

It is an arithmetic number, because the mean of its divisors is an integer number (10796004).

Almost surely, 2^42784057 is an apocalyptic number.

It is an amenable number.

42784057 is a deficient number, since it is larger than the sum of its proper divisors (399959).

42784057 is a wasteful number, since it uses less digits than its factorization.

42784057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399958.

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 42784057 is about 6540.9523006975. The cubic root of 42784057 is about 349.7523608811.

The spelling of 42784057 in words is "forty-two million, seven hundred eighty-four thousand, fifty-seven".