42978713 has 4 divisors (see below), whose sum is σ = 42991908. Its totient is φ = 42965520.

The previous prime is 42978659. The next prime is 42978721. The reversal of 42978713 is 31787924.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6822544 + 36156169 = 2612^2 + 6013^2 .

It is a cyclic number.

It is not a de Polignac number, because 42978713 - 2²⁰ = 41930137 is a prime.

It is a super-2 number, since 2×42978713² = 3694339542272738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42978773) 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, 2195 + ... + 9527.

It is an arithmetic number, because the mean of its divisors is an integer number (10747977).

Almost surely, 2^42978713 is an apocalyptic number.

It is an amenable number.

42978713 is a deficient number, since it is larger than the sum of its proper divisors (13195).

42978713 is an equidigital number, since it uses as much as digits as its factorization.

42978713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13194.

The product of its digits is 84672, while the sum is 41.

The square root of 42978713 is about 6555.8152048391. The cubic root of 42978713 is about 350.2819849966.

The spelling of 42978713 in words is "forty-two million, nine hundred seventy-eight thousand, seven hundred thirteen".