42043789 has 4 divisors (see below), whose sum is σ = 44256640. Its totient is φ = 39830940.

The previous prime is 42043769. The next prime is 42043817. The reversal of 42043789 is 98734024.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42043789 - 2²⁵ = 8489357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42043739) 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, 1106397 + ... + 1106434.

It is an arithmetic number, because the mean of its divisors is an integer number (11064160).

Almost surely, 2^42043789 is an apocalyptic number.

It is an amenable number.

42043789 is a deficient number, since it is larger than the sum of its proper divisors (2212851).

42043789 is a wasteful number, since it uses less digits than its factorization.

42043789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212850.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 42043789 is about 6484.1182129878. The cubic root of 42043789 is about 347.7234254910.

The spelling of 42043789 in words is "forty-two million, forty-three thousand, seven hundred eighty-nine".