42505789 has 4 divisors (see below), whose sum is σ = 42626556. Its totient is φ = 42385024.

The previous prime is 42505787. The next prime is 42505819. The reversal of 42505789 is 98750524.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34609689 + 7896100 = 5883^2 + 2810^2 .

It is a cyclic number.

It is not a de Polignac number, because 42505789 - 2¹ = 42505787 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 (42505781) 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, 59854 + ... + 60559.

It is an arithmetic number, because the mean of its divisors is an integer number (10656639).

Almost surely, 2^42505789 is an apocalyptic number.

It is an amenable number.

42505789 is a deficient number, since it is larger than the sum of its proper divisors (120767).

42505789 is a wasteful number, since it uses less digits than its factorization.

42505789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120766.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 42505789 is about 6519.6463861164. The cubic root of 42505789 is about 348.9924465324.

The spelling of 42505789 in words is "forty-two million, five hundred five thousand, seven hundred eighty-nine".