42820093 has 4 divisors (see below), whose sum is σ = 45338940. Its totient is φ = 40301248.

The previous prime is 42820079. The next prime is 42820097. The reversal of 42820093 is 39002824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14538969 + 28281124 = 3813^2 + 5318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42820093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42820097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1259398 + ... + 1259431.

It is an arithmetic number, because the mean of its divisors is an integer number (11334735).

Almost surely, 2^42820093 is an apocalyptic number.

It is an amenable number.

42820093 is a deficient number, since it is larger than the sum of its proper divisors (2518847).

42820093 is a wasteful number, since it uses less digits than its factorization.

42820093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518846.

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

The square root of 42820093 is about 6543.7063656616. The cubic root of 42820093 is about 349.8505293736.

The spelling of 42820093 in words is "forty-two million, eight hundred twenty thousand, ninety-three".