42778297 has 4 divisors (see below), whose sum is σ = 43156980. Its totient is φ = 42399616.

The previous prime is 42778289. The next prime is 42778303. The reversal of 42778297 is 79287724.

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 16451136 + 26327161 = 4056^2 + 5131^2 .

It is a cyclic number.

It is not a de Polignac number, because 42778297 - 2³ = 42778289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42778207) 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, 189172 + ... + 189397.

It is an arithmetic number, because the mean of its divisors is an integer number (10789245).

Almost surely, 2^42778297 is an apocalyptic number.

It is an amenable number.

42778297 is a deficient number, since it is larger than the sum of its proper divisors (378683).

42778297 is a wasteful number, since it uses less digits than its factorization.

42778297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378682.

The product of its digits is 395136, while the sum is 46.

The square root of 42778297 is about 6540.5119830178. The cubic root of 42778297 is about 349.7366645045.

The spelling of 42778297 in words is "forty-two million, seven hundred seventy-eight thousand, two hundred ninety-seven".