42723638 has 16 divisors (see below), whose sum is σ = 64932576. Its totient is φ = 21081600.

The previous prime is 42723623. The next prime is 42723643. The reversal of 42723638 is 83632724.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 42723598 and 42723607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57920 + ... + 58652.

It is an arithmetic number, because the mean of its divisors is an integer number (4058286).

Almost surely, 2^42723638 is an apocalyptic number.

42723638 is a deficient number, since it is larger than the sum of its proper divisors (22208938).

42723638 is a wasteful number, since it uses less digits than its factorization.

42723638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079.

The product of its digits is 48384, while the sum is 35.

The square root of 42723638 is about 6536.3321519029. The cubic root of 42723638 is about 349.5876449840.

The spelling of 42723638 in words is "forty-two million, seven hundred twenty-three thousand, six hundred thirty-eight".