42756489 has 12 divisors (see below), whose sum is σ = 61981296. Its totient is φ = 28401912.

The previous prime is 42756443. The next prime is 42756499. The reversal of 42756489 is 98465724.

It is a happy number.

42756489 is a `hidden beast` number, since 4 + 2 + 7 + 564 + 89 = 666.

It is not a de Polignac number, because 42756489 - 2¹² = 42752393 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42756499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5847 + ... + 10940.

It is an arithmetic number, because the mean of its divisors is an integer number (5165108).

Almost surely, 2^42756489 is an apocalyptic number.

It is an amenable number.

42756489 is a deficient number, since it is larger than the sum of its proper divisors (19224807).

42756489 is a wasteful number, since it uses less digits than its factorization.

42756489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17076 (or 17073 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 42756489 is about 6538.8446227143. The cubic root of 42756489 is about 349.6772235095.

The spelling of 42756489 in words is "forty-two million, seven hundred fifty-six thousand, four hundred eighty-nine".