42105928 has 8 divisors (see below), whose sum is σ = 78948630. Its totient is φ = 21052960.

The previous prime is 42105913. The next prime is 42105929. The reversal of 42105928 is 82950124.

It can be written as a sum of positive squares in only one way, i.e., 26440164 + 15665764 = 5142^2 + 3958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 42105928.

It is not an unprimeable number, because it can be changed into a prime (42105929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2631613 + ... + 2631628.

Almost surely, 2^42105928 is an apocalyptic number.

It is an amenable number.

42105928 is a deficient number, since it is larger than the sum of its proper divisors (36842702).

42105928 is a wasteful number, since it uses less digits than its factorization.

42105928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263247 (or 5263243 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 42105928 is about 6488.9080745531. The cubic root of 42105928 is about 347.8946481641.

The spelling of 42105928 in words is "forty-two million, one hundred five thousand, nine hundred twenty-eight".