729381 has 8 divisors (see below), whose sum is σ = 998944. Its totient is φ = 473040.

The previous prime is 729373. The next prime is 729389. The reversal of 729381 is 183927.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (729373) and next prime (729389).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 729381 - 2³ = 729373 is a prime.

It is a super-2 number, since 2×729381² = 1063993286322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (729389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3175 + ... + 3396.

It is an arithmetic number, because the mean of its divisors is an integer number (124868).

2⁷²⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

729381 is a deficient number, since it is larger than the sum of its proper divisors (269563).

729381 is a wasteful number, since it uses less digits than its factorization.

729381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6611.

The product of its digits is 3024, while the sum is 30.

The square root of 729381 is about 854.0380553582. The cubic root of 729381 is about 90.0156762817.

It can be divided in two parts, 72 and 9381, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 729381 in words is "seven hundred twenty-nine thousand, three hundred eighty-one".