439404051421 has 2 divisors, whose sum is σ = 439404051422. Its totient is φ = 439404051420.

The previous prime is 439404051391. The next prime is 439404051461. The reversal of 439404051421 is 124150404934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 258790951225 + 180613100196 = 508715^2 + 424986^2 .

It is a cyclic number.

It is not a de Polignac number, because 439404051421 - 2²³ = 439395662813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439404051461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219702025710 + 219702025711.

It is an arithmetic number, because the mean of its divisors is an integer number (219702025711).

Almost surely, 2^439404051421 is an apocalyptic number.

It is an amenable number.

439404051421 is a deficient number, since it is larger than the sum of its proper divisors (1).

439404051421 is an equidigital number, since it uses as much as digits as its factorization.

439404051421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 439404051421 in words is "four hundred thirty-nine billion, four hundred four million, fifty-one thousand, four hundred twenty-one".