72407209 has 8 divisors (see below), whose sum is σ = 82892288. Its totient is φ = 61957440.

The previous prime is 72407207. The next prime is 72407239. The reversal of 72407209 is 90270427.

It is a happy number.

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 72407209 - 2¹ = 72407207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72407207) 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, 4272 + ... + 12769.

It is an arithmetic number, because the mean of its divisors is an integer number (10361536).

Almost surely, 2^72407209 is an apocalyptic number.

It is an amenable number.

72407209 is a deficient number, since it is larger than the sum of its proper divisors (10485079).

72407209 is a wasteful number, since it uses less digits than its factorization.

72407209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17655.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 72407209 is about 8509.2425632368. The cubic root of 72407209 is about 416.7995766571.

The spelling of 72407209 in words is "seventy-two million, four hundred seven thousand, two hundred nine".