42731689 has 16 divisors (see below), whose sum is σ = 57375360. Its totient is φ = 30735360.

The previous prime is 42731687. The next prime is 42731743. The reversal of 42731689 is 98613724.

It is a cyclic number.

It is not a de Polignac number, because 42731689 - 2¹ = 42731687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42731681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20344 + ... + 22345.

It is an arithmetic number, because the mean of its divisors is an integer number (3585960).

Almost surely, 2^42731689 is an apocalyptic number.

It is an amenable number.

42731689 is a deficient number, since it is larger than the sum of its proper divisors (14643671).

42731689 is a wasteful number, since it uses less digits than its factorization.

42731689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42720.

The product of its digits is 72576, while the sum is 40.

The square root of 42731689 is about 6536.9479881670. The cubic root of 42731689 is about 349.6096028001.

The spelling of 42731689 in words is "forty-two million, seven hundred thirty-one thousand, six hundred eighty-nine".