72147 has 4 divisors (see below), whose sum is σ = 96200. Its totient is φ = 48096.

The previous prime is 72139. The next prime is 72161. The reversal of 72147 is 74127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74127 = 3 ⋅24709.

It is not a de Polignac number, because 72147 - 2³ = 72139 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12022 + ... + 12027.

It is an arithmetic number, because the mean of its divisors is an integer number (24050).

2⁷²¹⁴⁷ is an apocalyptic number.

72147 is a deficient number, since it is larger than the sum of its proper divisors (24053).

72147 is a wasteful number, since it uses less digits than its factorization.

72147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24052.

The product of its digits is 392, while the sum is 21.

The square root of 72147 is about 268.6019359573. The cubic root of 72147 is about 41.6299694668.

The spelling of 72147 in words is "seventy-two thousand, one hundred forty-seven", and thus it is an iban number.