42610639 has 4 divisors (see below), whose sum is σ = 42695856. Its totient is φ = 42525424.

The previous prime is 42610627. The next prime is 42610649. The reversal of 42610639 is 93601624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42610639 - 2⁷ = 42610511 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42610639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42610649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41854 + ... + 42859.

It is an arithmetic number, because the mean of its divisors is an integer number (10673964).

Almost surely, 2^42610639 is an apocalyptic number.

42610639 is a deficient number, since it is larger than the sum of its proper divisors (85217).

42610639 is an equidigital number, since it uses as much as digits as its factorization.

42610639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85216.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 42610639 is about 6527.6825137257. The cubic root of 42610639 is about 349.2791667864.

The spelling of 42610639 in words is "forty-two million, six hundred ten thousand, six hundred thirty-nine".