42840679 has 4 divisors (see below), whose sum is σ = 48960784. Its totient is φ = 36720576.

The previous prime is 42840661. The next prime is 42840683. The reversal of 42840679 is 97604824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42840679 - 2¹⁵ = 42807911 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 (42840659) 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, 3060042 + ... + 3060055.

It is an arithmetic number, because the mean of its divisors is an integer number (12240196).

Almost surely, 2^42840679 is an apocalyptic number.

42840679 is a deficient number, since it is larger than the sum of its proper divisors (6120105).

42840679 is an equidigital number, since it uses as much as digits as its factorization.

42840679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6120104.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 42840679 is about 6545.2791384325. The cubic root of 42840679 is about 349.9065845933.

The spelling of 42840679 in words is "forty-two million, eight hundred forty thousand, six hundred seventy-nine".