727981 has 2 divisors, whose sum is σ = 727982. Its totient is φ = 727980.

The previous prime is 727949. The next prime is 727997. The reversal of 727981 is 189727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538756 + 189225 = 734^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 727981 - 2⁵ = 727949 is a prime.

It is a super-2 number, since 2×727981² = 1059912672722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (727781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363990 + 363991.

It is an arithmetic number, because the mean of its divisors is an integer number (363991).

2⁷²⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

727981 is a deficient number, since it is larger than the sum of its proper divisors (1).

727981 is an equidigital number, since it uses as much as digits as its factorization.

727981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 34.

The square root of 727981 is about 853.2180260637. The cubic root of 727981 is about 89.9580462898.

The spelling of 727981 in words is "seven hundred twenty-seven thousand, nine hundred eighty-one".