42709639 has 8 divisors (see below), whose sum is σ = 48898080. Its totient is φ = 36542976.

The previous prime is 42709637. The next prime is 42709651. The reversal of 42709639 is 93690724.

42709639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42709639 - 2¹ = 42709637 is a prime.

It is a super-2 number, since 2×42709639² = 3648226527020642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42709631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 994 + ... + 9295.

It is an arithmetic number, because the mean of its divisors is an integer number (6112260).

Almost surely, 2^42709639 is an apocalyptic number.

42709639 is a deficient number, since it is larger than the sum of its proper divisors (6188441).

42709639 is a wasteful number, since it uses less digits than its factorization.

42709639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10889.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 42709639 is about 6535.2612036551. The cubic root of 42709639 is about 349.5494583791.

The spelling of 42709639 in words is "forty-two million, seven hundred nine thousand, six hundred thirty-nine".