729388442 has 8 divisors (see below), whose sum is σ = 1120767732. Its totient is φ = 355799200.

The previous prime is 729388399. The next prime is 729388453. The reversal of 729388442 is 244883927.

It can be written as a sum of positive squares in 2 ways, for example, as 580279921 + 149108521 = 24089^2 + 12211^2 .

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

It is a super-4 number, since 4×729388442⁴ (a number of 37 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4447409 + ... + 4447572.

Almost surely, 2^729388442 is an apocalyptic number.

729388442 is a deficient number, since it is larger than the sum of its proper divisors (391379290).

729388442 is a wasteful number, since it uses less digits than its factorization.

729388442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8895024.

The product of its digits is 774144, while the sum is 47.

The square root of 729388442 is about 27007.1924123927. The cubic root of 729388442 is about 900.1598242912.

It can be divided in two parts, 7293884 and 42, that multiplied together give a triangular number (306343128 = T₂₄₇₅₂).

The spelling of 729388442 in words is "seven hundred twenty-nine million, three hundred eighty-eight thousand, four hundred forty-two".