42456789 has 6 divisors (see below), whose sum is σ = 61326486. Its totient is φ = 28304520.

The previous prime is 42456779. The next prime is 42456809. The reversal of 42456789 is 98765424.

It is a happy number.

42456789 is a `hidden beast` number, since 4 + 2 + 4 + 567 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39162564 + 3294225 = 6258^2 + 1815^2 .

It is not a de Polignac number, because 42456789 - 2⁹ = 42456277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42456749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2358702 + ... + 2358719.

It is an arithmetic number, because the mean of its divisors is an integer number (10221081).

Almost surely, 2^42456789 is an apocalyptic number.

It is an amenable number.

42456789 is a deficient number, since it is larger than the sum of its proper divisors (18869697).

42456789 is a wasteful number, since it uses less digits than its factorization.

42456789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4717427 (or 4717424 counting only the distinct ones).

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

The square root of 42456789 is about 6515.8874299668. The cubic root of 42456789 is about 348.8582906475.

The spelling of 42456789 in words is "forty-two million, four hundred fifty-six thousand, seven hundred eighty-nine".