42109642 has 32 divisors (see below), whose sum is σ = 68745600. Its totient is φ = 19293120.

The previous prime is 42109609. The next prime is 42109693. The reversal of 42109642 is 24690124.

It is a self number, because there is not a number n which added to its sum of digits gives 42109642.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120484 + ... + 120832.

It is an arithmetic number, because the mean of its divisors is an integer number (2148300).

Almost surely, 2^42109642 is an apocalyptic number.

42109642 is a deficient number, since it is larger than the sum of its proper divisors (26635958).

42109642 is a wasteful number, since it uses less digits than its factorization.

42109642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 42109642 is about 6489.1942489033. The cubic root of 42109642 is about 347.9048766743.

Adding to 42109642 its reverse (24690124), we get a palindrome (66799766).

The spelling of 42109642 in words is "forty-two million, one hundred nine thousand, six hundred forty-two".