673727381 has 2 divisors, whose sum is σ = 673727382. Its totient is φ = 673727380.

The previous prime is 673727359. The next prime is 673727387. The reversal of 673727381 is 183727376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 624250225 + 49477156 = 24985^2 + 7034^2 .

It is a cyclic number.

It is not a de Polignac number, because 673727381 - 2¹⁰ = 673726357 is a prime.

It is a super-2 number, since 2×673727381² = 907817167818238322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673727387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336863690 + 336863691.

It is an arithmetic number, because the mean of its divisors is an integer number (336863691).

Almost surely, 2^673727381 is an apocalyptic number.

It is an amenable number.

673727381 is a deficient number, since it is larger than the sum of its proper divisors (1).

673727381 is an equidigital number, since it uses as much as digits as its factorization.

673727381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 44.

The square root of 673727381 is about 25956.2589947011. The cubic root of 673727381 is about 876.6536916031.

The spelling of 673727381 in words is "six hundred seventy-three million, seven hundred twenty-seven thousand, three hundred eighty-one".