729992 has 8 divisors (see below), whose sum is σ = 1368750. Its totient is φ = 364992.

The previous prime is 729991. The next prime is 730003. The reversal of 729992 is 299927.

It can be written as a sum of positive squares in only one way, i.e., 729316 + 676 = 854^2 + 26^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (729991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45617 + ... + 45632.

2⁷²⁹⁹⁹² is an apocalyptic number.

It is an amenable number.

729992 is a deficient number, since it is larger than the sum of its proper divisors (638758).

729992 is a wasteful number, since it uses less digits than its factorization.

729992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91255 (or 91251 counting only the distinct ones).

The product of its digits is 20412, while the sum is 38.

The square root of 729992 is about 854.3956928730. The cubic root of 729992 is about 90.0408045424.

The spelling of 729992 in words is "seven hundred twenty-nine thousand, nine hundred ninety-two".