42978259 has 4 divisors (see below), whose sum is σ = 43027816. Its totient is φ = 42928704.

The previous prime is 42978251. The next prime is 42978311. The reversal of 42978259 is 95287924.

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 42978259 - 2³ = 42978251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42978251) 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, 23454 + ... + 25219.

It is an arithmetic number, because the mean of its divisors is an integer number (10756954).

Almost surely, 2^42978259 is an apocalyptic number.

42978259 is a deficient number, since it is larger than the sum of its proper divisors (49557).

42978259 is an equidigital number, since it uses as much as digits as its factorization.

42978259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49556.

The product of its digits is 362880, while the sum is 46.

The square root of 42978259 is about 6555.7805790005. The cubic root of 42978259 is about 350.2807516063.

The spelling of 42978259 in words is "forty-two million, nine hundred seventy-eight thousand, two hundred fifty-nine".