42720893 has 8 divisors (see below), whose sum is σ = 44154936. Its totient is φ = 41305600.

The previous prime is 42720889. The next prime is 42720901. The reversal of 42720893 is 39802724.

It can be written as a sum of positive squares in 4 ways, for example, as 40804 + 42680089 = 202^2 + 6533^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42720893 - 2² = 42720889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42720193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23 + ... + 9243.

It is an arithmetic number, because the mean of its divisors is an integer number (5519367).

Almost surely, 2^42720893 is an apocalyptic number.

It is an amenable number.

42720893 is a deficient number, since it is larger than the sum of its proper divisors (1434043).

42720893 is a wasteful number, since it uses less digits than its factorization.

42720893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9375.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 42720893 is about 6536.1221683809. The cubic root of 42720893 is about 349.5801578045.

The spelling of 42720893 in words is "forty-two million, seven hundred twenty thousand, eight hundred ninety-three".