439684431989 has 16 divisors (see below), whose sum is σ = 510986594880. Its totient is φ = 373892578560.

The previous prime is 439684431971. The next prime is 439684431997. The reversal of 439684431989 is 989134486934.

It is a cyclic number.

It is not a de Polignac number, because 439684431989 - 2¹² = 439684427893 is a prime.

It is a super-2 number, since 2×439684431989² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439684431919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7181954 + ... + 7242915.

It is an arithmetic number, because the mean of its divisors is an integer number (31936662180).

Almost surely, 2^439684431989 is an apocalyptic number.

It is an amenable number.

439684431989 is a deficient number, since it is larger than the sum of its proper divisors (71302162891).

439684431989 is a wasteful number, since it uses less digits than its factorization.

439684431989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14425060.

The product of its digits is 161243136, while the sum is 68.

Subtracting 439684431989 from its reverse (989134486934), we obtain a palindrome (549450054945).

The spelling of 439684431989 in words is "four hundred thirty-nine billion, six hundred eighty-four million, four hundred thirty-one thousand, nine hundred eighty-nine".