42705457 has 4 divisors (see below), whose sum is σ = 44562240. Its totient is φ = 40848676.

The previous prime is 42705431. The next prime is 42705461. The reversal of 42705457 is 75450724.

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 42705457 - 2⁷ = 42705329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42705497) 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, 928357 + ... + 928402.

It is an arithmetic number, because the mean of its divisors is an integer number (11140560).

Almost surely, 2^42705457 is an apocalyptic number.

It is an amenable number.

42705457 is a deficient number, since it is larger than the sum of its proper divisors (1856783).

42705457 is a wasteful number, since it uses less digits than its factorization.

42705457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856782.

The product of its (nonzero) digits is 39200, while the sum is 34.

The square root of 42705457 is about 6534.9412392155. The cubic root of 42705457 is about 349.5380490612.

The spelling of 42705457 in words is "forty-two million, seven hundred five thousand, four hundred fifty-seven".