42766389 has 12 divisors (see below), whose sum is σ = 62939916. Its totient is φ = 27972672.

The previous prime is 42766379. The next prime is 42766417. The reversal of 42766389 is 98366724.

42766389 is a `hidden beast` number, since 4 + 2 + 7 + 6 + 638 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 38229489 + 4536900 = 6183^2 + 2130^2 .

It is not a de Polignac number, because 42766389 - 2⁵ = 42766357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42766309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44352 + ... + 45305.

It is an arithmetic number, because the mean of its divisors is an integer number (5244993).

Almost surely, 2^42766389 is an apocalyptic number.

It is an amenable number.

42766389 is a deficient number, since it is larger than the sum of its proper divisors (20173527).

42766389 is a wasteful number, since it uses less digits than its factorization.

42766389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89716 (or 89713 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 42766389 is about 6539.6015933694. The cubic root of 42766389 is about 349.7042099579.

The spelling of 42766389 in words is "forty-two million, seven hundred sixty-six thousand, three hundred eighty-nine".