72439321 has 8 divisors (see below), whose sum is σ = 73851264. Its totient is φ = 71041200.

The previous prime is 72439313. The next prime is 72439327. The reversal of 72439321 is 12393427.

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

It is a cyclic number.

It is not a de Polignac number, because 72439321 - 2³ = 72439313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72439327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7456 + ... + 14158.

It is an arithmetic number, because the mean of its divisors is an integer number (9231408).

Almost surely, 2^72439321 is an apocalyptic number.

It is an amenable number.

72439321 is a deficient number, since it is larger than the sum of its proper divisors (1411943).

72439321 is a wasteful number, since it uses less digits than its factorization.

72439321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911.

The product of its digits is 9072, while the sum is 31.

The square root of 72439321 is about 8511.1292435258. The cubic root of 72439321 is about 416.8611832755.

The spelling of 72439321 in words is "seventy-two million, four hundred thirty-nine thousand, three hundred twenty-one".