42378317 has 4 divisors (see below), whose sum is σ = 42393276. Its totient is φ = 42363360.

The previous prime is 42378311. The next prime is 42378319. The reversal of 42378317 is 71387324.

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 724201 + 41654116 = 851^2 + 6454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42378317 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 (42378311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784 + ... + 9377.

It is an arithmetic number, because the mean of its divisors is an integer number (10598319).

Almost surely, 2^42378317 is an apocalyptic number.

It is an amenable number.

42378317 is a deficient number, since it is larger than the sum of its proper divisors (14959).

42378317 is a wasteful number, since it uses less digits than its factorization.

42378317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14958.

The product of its digits is 28224, while the sum is 35.

The square root of 42378317 is about 6509.8630553953. The cubic root of 42378317 is about 348.6432289209.

The spelling of 42378317 in words is "forty-two million, three hundred seventy-eight thousand, three hundred seventeen".