729919 has 2 divisors, whose sum is σ = 729920. Its totient is φ = 729918.

The previous prime is 729913. The next prime is 729931. The reversal of 729919 is 919927.

It is a weak prime.

It is an emirp because it is prime and its reverse (919927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 729919 - 2⁷ = 729791 is a prime.

It is a super-2 number, since 2×729919² = 1065563493122, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (729913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 364959 + 364960.

It is an arithmetic number, because the mean of its divisors is an integer number (364960).

2⁷²⁹⁹¹⁹ is an apocalyptic number.

729919 is a deficient number, since it is larger than the sum of its proper divisors (1).

729919 is an equidigital number, since it uses as much as digits as its factorization.

729919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 37.

The square root of 729919 is about 854.3529715522. The cubic root of 729919 is about 90.0378030493.

The spelling of 729919 in words is "seven hundred twenty-nine thousand, nine hundred nineteen".