42045643 has 4 divisors (see below), whose sum is σ = 42167160. Its totient is φ = 41924128.

The previous prime is 42045637. The next prime is 42045659. The reversal of 42045643 is 34654024.

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 42045643 - 2¹³ = 42037451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42045943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60238 + ... + 60931.

It is an arithmetic number, because the mean of its divisors is an integer number (10541790).

Almost surely, 2^42045643 is an apocalyptic number.

42045643 is a deficient number, since it is larger than the sum of its proper divisors (121517).

42045643 is a wasteful number, since it uses less digits than its factorization.

42045643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121516.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 42045643 is about 6484.2611761094. The cubic root of 42045643 is about 347.7285365888.

Adding to 42045643 its reverse (34654024), we get a palindrome (76699667).

The spelling of 42045643 in words is "forty-two million, forty-five thousand, six hundred forty-three".