439901993 has 2 divisors, whose sum is σ = 439901994. Its totient is φ = 439901992.

The previous prime is 439901989. The next prime is 439902007. The reversal of 439901993 is 399109934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346257664 + 93644329 = 18608^2 + 9677^2 .

It is a cyclic number.

It is not a de Polignac number, because 439901993 - 2² = 439901989 is a prime.

It is not a weakly prime, because it can be changed into another prime (439901923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219950996 + 219950997.

It is an arithmetic number, because the mean of its divisors is an integer number (219950997).

Almost surely, 2^439901993 is an apocalyptic number.

It is an amenable number.

439901993 is a deficient number, since it is larger than the sum of its proper divisors (1).

439901993 is an equidigital number, since it uses as much as digits as its factorization.

439901993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236196, while the sum is 47.

The square root of 439901993 is about 20973.8406830986. The cubic root of 439901993 is about 760.5340158434.

The spelling of 439901993 in words is "four hundred thirty-nine million, nine hundred one thousand, nine hundred ninety-three".