42312789 has 6 divisors (see below), whose sum is σ = 61118486. Its totient is φ = 28208520.

The previous prime is 42312763. The next prime is 42312811. The reversal of 42312789 is 98721324.

It can be written as a sum of positive squares in only one way, i.e., 35640900 + 6671889 = 5970^2 + 2583^2 .

It is not a de Polignac number, because 42312789 - 2⁵ = 42312757 is a prime.

It is a super-2 number, since 2×42312789² = 3580744225917042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42312749) 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 5 ways as a sum of consecutive naturals, for example, 2350702 + ... + 2350719.

Almost surely, 2^42312789 is an apocalyptic number.

It is an amenable number.

42312789 is a deficient number, since it is larger than the sum of its proper divisors (18805697).

42312789 is a wasteful number, since it uses less digits than its factorization.

42312789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701427 (or 4701424 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 42312789 is about 6504.8281299355. The cubic root of 42312789 is about 348.4634382442.

The spelling of 42312789 in words is "forty-two million, three hundred twelve thousand, seven hundred eighty-nine".