42991043 has 4 divisors (see below), whose sum is σ = 43006488. Its totient is φ = 42975600.

The previous prime is 42991009. The next prime is 42991049. The reversal of 42991043 is 34019924.

It is a happy number.

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 42991043 - 2¹⁸ = 42728899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42991049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2258 + ... + 9543.

It is an arithmetic number, because the mean of its divisors is an integer number (10751622).

Almost surely, 2^42991043 is an apocalyptic number.

42991043 is a deficient number, since it is larger than the sum of its proper divisors (15445).

42991043 is a wasteful number, since it uses less digits than its factorization.

42991043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15444.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 42991043 is about 6556.7555238853. The cubic root of 42991043 is about 350.3154788173.

The spelling of 42991043 in words is "forty-two million, nine hundred ninety-one thousand, forty-three".