42056545 has 8 divisors (see below), whose sum is σ = 50725224. Its totient is φ = 33473664.

The previous prime is 42056543. The next prime is 42056551. The reversal of 42056545 is 54565024.

It can be written as a sum of positive squares in 4 ways, for example, as 7623121 + 34433424 = 2761^2 + 5868^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 42056545 - 2¹ = 42056543 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42056543) 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, 20364 + ... + 22333.

It is an arithmetic number, because the mean of its divisors is an integer number (6340653).

Almost surely, 2^42056545 is an apocalyptic number.

It is an amenable number.

42056545 is a deficient number, since it is larger than the sum of its proper divisors (8668679).

42056545 is a wasteful number, since it uses less digits than its factorization.

42056545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42899.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 42056545 is about 6485.1017725245. The cubic root of 42056545 is about 347.7585881283.

It can be divided in two parts, 420 and 56545, that added together give a palindrome (56965).

The spelling of 42056545 in words is "forty-two million, fifty-six thousand, five hundred forty-five".