72321839 has 8 divisors (see below), whose sum is σ = 74224080. Its totient is φ = 70439616.

The previous prime is 72321833. The next prime is 72321841. The reversal of 72321839 is 93812327.

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 72321839 - 2²⁴ = 55544623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72321799 and 72321808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72321833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2459 + ... + 12275.

It is an arithmetic number, because the mean of its divisors is an integer number (9278010).

Almost surely, 2^72321839 is an apocalyptic number.

72321839 is a deficient number, since it is larger than the sum of its proper divisors (1902241).

72321839 is a wasteful number, since it uses less digits than its factorization.

72321839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10009.

The product of its digits is 18144, while the sum is 35.

The square root of 72321839 is about 8504.2247736052. The cubic root of 72321839 is about 416.6357063573.

The spelling of 72321839 in words is "seventy-two million, three hundred twenty-one thousand, eight hundred thirty-nine".