42978313 has 8 divisors (see below), whose sum is σ = 49710528. Its totient is φ = 36394224.

The previous prime is 42978311. The next prime is 42978317. The reversal of 42978313 is 31387924.

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 42978313 - 2¹ = 42978311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42978311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36406 + ... + 37567.

It is an arithmetic number, because the mean of its divisors is an integer number (6213816).

Almost surely, 2^42978313 is an apocalyptic number.

It is an amenable number.

42978313 is a deficient number, since it is larger than the sum of its proper divisors (6732215).

42978313 is an equidigital number, since it uses as much as digits as its factorization.

42978313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74063.

The product of its digits is 36288, while the sum is 37.

The square root of 42978313 is about 6555.7846975019. The cubic root of 42978313 is about 350.2808983096.

The spelling of 42978313 in words is "forty-two million, nine hundred seventy-eight thousand, three hundred thirteen".