729575381 has 4 divisors (see below), whose sum is σ = 730380672. Its totient is φ = 728770092.

The previous prime is 729575317. The next prime is 729575401. The reversal of 729575381 is 183575927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183575927 = 293 ⋅626539.

It is a cyclic number.

It is not a de Polignac number, because 729575381 - 2⁶ = 729575317 is a prime.

It is a super-2 number, since 2×729575381² = 1064560473122590322, 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 (729574381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401285 + ... + 403098.

It is an arithmetic number, because the mean of its divisors is an integer number (182595168).

Almost surely, 2^729575381 is an apocalyptic number.

It is an amenable number.

729575381 is a deficient number, since it is larger than the sum of its proper divisors (805291).

729575381 is an equidigital number, since it uses as much as digits as its factorization.

729575381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805290.

The product of its digits is 529200, while the sum is 47.

The square root of 729575381 is about 27010.6531020633. The cubic root of 729575381 is about 900.2367200364.

The spelling of 729575381 in words is "seven hundred twenty-nine million, five hundred seventy-five thousand, three hundred eighty-one".