42907689 has 54 divisors (see below), whose sum is σ = 72109674. Its totient is φ = 24552000.

The previous prime is 42907603. The next prime is 42907693. The reversal of 42907689 is 98670924.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26163225 + 16744464 = 5115^2 + 4092^2 .

It is not a de Polignac number, because 42907689 - 2⁷ = 42907561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42907699) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1046509 + ... + 1046549.

Almost surely, 2^42907689 is an apocalyptic number.

It is an amenable number.

42907689 is a deficient number, since it is larger than the sum of its proper divisors (29201985).

42907689 is a wasteful number, since it uses less digits than its factorization.

42907689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 42907689 is about 6550.3960948938. The cubic root of 42907689 is about 350.0889270636.

The spelling of 42907689 in words is "forty-two million, nine hundred seven thousand, six hundred eighty-nine".