72972943 has 4 divisors (see below), whose sum is σ = 73062648. Its totient is φ = 72883240.

The previous prime is 72972929. The next prime is 72972971. The reversal of 72972943 is 34927927.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72972943 - 2¹³ = 72964751 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72972943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72972923) 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, 43621 + ... + 45262.

It is an arithmetic number, because the mean of its divisors is an integer number (18265662).

Almost surely, 2^72972943 is an apocalyptic number.

72972943 is a deficient number, since it is larger than the sum of its proper divisors (89705).

72972943 is an equidigital number, since it uses as much as digits as its factorization.

72972943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89704.

The product of its digits is 190512, while the sum is 43.

The square root of 72972943 is about 8542.4202074119. The cubic root of 72972943 is about 417.8822783804.

The spelling of 72972943 in words is "seventy-two million, nine hundred seventy-two thousand, nine hundred forty-three".