729922 has 4 divisors (see below), whose sum is σ = 1094886. Its totient is φ = 364960.

The previous prime is 729919. The next prime is 729931. The reversal of 729922 is 229927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 229927 = 31 ⋅7417.

It can be written as a sum of positive squares in only one way, i.e., 561001 + 168921 = 749^2 + 411^2 .

It is a super-2 number, since 2×729922² = 1065572252168, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182479 + ... + 182482.

2⁷²⁹⁹²² is an apocalyptic number.

729922 is a deficient number, since it is larger than the sum of its proper divisors (364964).

729922 is a wasteful number, since it uses less digits than its factorization.

729922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364963.

The product of its digits is 4536, while the sum is 31.

The square root of 729922 is about 854.3547272650. The cubic root of 729922 is about 90.0379264022.

It can be divided in two parts, 7 and 29922, that added together give a square (29929 = 173²).

The spelling of 729922 in words is "seven hundred twenty-nine thousand, nine hundred twenty-two".