439978613 has 2 divisors, whose sum is σ = 439978614. Its totient is φ = 439978612.

The previous prime is 439978589. The next prime is 439978619. The reversal of 439978613 is 316879934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 433389124 + 6589489 = 20818^2 + 2567^2 .

It is a cyclic number.

It is not a de Polignac number, because 439978613 - 2¹⁶ = 439913077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439978619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219989306 + 219989307.

It is an arithmetic number, because the mean of its divisors is an integer number (219989307).

Almost surely, 2^439978613 is an apocalyptic number.

It is an amenable number.

439978613 is a deficient number, since it is larger than the sum of its proper divisors (1).

439978613 is an equidigital number, since it uses as much as digits as its factorization.

439978613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 439978613 is about 20975.6671645981. The cubic root of 439978613 is about 760.5781686580.

The spelling of 439978613 in words is "four hundred thirty-nine million, nine hundred seventy-eight thousand, six hundred thirteen".