42001543 has 4 divisors (see below), whose sum is σ = 44472240. Its totient is φ = 39530848.

The previous prime is 42001529. The next prime is 42001573. The reversal of 42001543 is 34510024.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42001543 - 2⁵ = 42001511 is a prime.

It is a super-2 number, since 2×42001543² = 3528259228761698, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42001543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42001573) 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, 1235323 + ... + 1235356.

It is an arithmetic number, because the mean of its divisors is an integer number (11118060).

Almost surely, 2^42001543 is an apocalyptic number.

42001543 is a deficient number, since it is larger than the sum of its proper divisors (2470697).

42001543 is a wasteful number, since it uses less digits than its factorization.

42001543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470696.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 42001543 is about 6480.8597423490. The cubic root of 42001543 is about 347.6069211898.

Adding to 42001543 its reverse (34510024), we get a palindrome (76511567).

The spelling of 42001543 in words is "forty-two million, one thousand, five hundred forty-three".