439689881 has 2 divisors, whose sum is σ = 439689882. Its totient is φ = 439689880.

The previous prime is 439689871. The next prime is 439689883. The reversal of 439689881 is 188986934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411440656 + 28249225 = 20284^2 + 5315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-439689881 is a prime.

It is a super-2 number, since 2×439689881² = 386654382907588322, which contains 22 as substring.

Together with 439689883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (439689883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219844940 + 219844941.

It is an arithmetic number, because the mean of its divisors is an integer number (219844941).

Almost surely, 2^439689881 is an apocalyptic number.

It is an amenable number.

439689881 is a deficient number, since it is larger than the sum of its proper divisors (1).

439689881 is an equidigital number, since it uses as much as digits as its factorization.

439689881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 56.

The square root of 439689881 is about 20968.7834887959. The cubic root of 439689881 is about 760.4117580611.

The spelling of 439689881 in words is "four hundred thirty-nine million, six hundred eighty-nine thousand, eight hundred eighty-one".