42730726 has 4 divisors (see below), whose sum is σ = 64096092. Its totient is φ = 21365362.

The previous prime is 42730703. The next prime is 42730729. The reversal of 42730726 is 62703724.

It is a happy number.

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

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (42730729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10682680 + ... + 10682683.

It is an arithmetic number, because the mean of its divisors is an integer number (16024023).

Almost surely, 2^42730726 is an apocalyptic number.

42730726 is a deficient number, since it is larger than the sum of its proper divisors (21365366).

42730726 is a wasteful number, since it uses less digits than its factorization.

42730726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21365365.

The product of its (nonzero) digits is 14112, while the sum is 31.

The square root of 42730726 is about 6536.8743295248. The cubic root of 42730726 is about 349.6069765167.

The spelling of 42730726 in words is "forty-two million, seven hundred thirty thousand, seven hundred twenty-six".