42989779 has 4 divisors (see below), whose sum is σ = 49131184. Its totient is φ = 36848376.

The previous prime is 42989747. The next prime is 42989789. The reversal of 42989779 is 97798924.

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 42989779 - 2⁵ = 42989747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42989789) 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, 3070692 + ... + 3070705.

It is an arithmetic number, because the mean of its divisors is an integer number (12282796).

Almost surely, 2^42989779 is an apocalyptic number.

42989779 is a deficient number, since it is larger than the sum of its proper divisors (6141405).

42989779 is an equidigital number, since it uses as much as digits as its factorization.

42989779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6141404.

The product of its digits is 2286144, while the sum is 55.

The square root of 42989779 is about 6556.6591340408. The cubic root of 42989779 is about 350.3120455200.

The spelling of 42989779 in words is "forty-two million, nine hundred eighty-nine thousand, seven hundred seventy-nine".