42742705 has 8 divisors (see below), whose sum is σ = 52542504. Its totient is φ = 33360000.

The previous prime is 42742703. The next prime is 42742747. The reversal of 42742705 is 50724724.

It can be written as a sum of positive squares in 4 ways, for example, as 23409 + 42719296 = 153^2 + 6536^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42742705 - 2¹ = 42742703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42742703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104046 + ... + 104455.

It is an arithmetic number, because the mean of its divisors is an integer number (6567813).

Almost surely, 2^42742705 is an apocalyptic number.

It is an amenable number.

42742705 is a deficient number, since it is larger than the sum of its proper divisors (9799799).

42742705 is a wasteful number, since it uses less digits than its factorization.

42742705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208547.

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 42742705 is about 6537.7905289172. The cubic root of 42742705 is about 349.6396427117.

The spelling of 42742705 in words is "forty-two million, seven hundred forty-two thousand, seven hundred five".