42978279 has 8 divisors (see below), whose sum is σ = 57670000. Its totient is φ = 28469376.

The previous prime is 42978251. The next prime is 42978311. The reversal of 42978279 is 97287924.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42978279 - 2¹³ = 42970087 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 (42973279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45154 + ... + 46095.

It is an arithmetic number, because the mean of its divisors is an integer number (7208750).

Almost surely, 2^42978279 is an apocalyptic number.

42978279 is a deficient number, since it is larger than the sum of its proper divisors (14691721).

42978279 is a wasteful number, since it uses less digits than its factorization.

42978279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91409.

The product of its digits is 508032, while the sum is 48.

The square root of 42978279 is about 6555.7821043717. The cubic root of 42978279 is about 350.2808059409.

The spelling of 42978279 in words is "forty-two million, nine hundred seventy-eight thousand, two hundred seventy-nine".