72381143 has 4 divisors (see below), whose sum is σ = 73297440. Its totient is φ = 71464848.

The previous prime is 72381137. The next prime is 72381167. The reversal of 72381143 is 34118327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34118327 = 227 ⋅150301.

It is a cyclic number.

It is not a de Polignac number, because 72381143 - 2¹⁴ = 72364759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72381343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458030 + ... + 458187.

It is an arithmetic number, because the mean of its divisors is an integer number (18324360).

Almost surely, 2^72381143 is an apocalyptic number.

72381143 is a deficient number, since it is larger than the sum of its proper divisors (916297).

72381143 is an equidigital number, since it uses as much as digits as its factorization.

72381143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916296.

The product of its digits is 4032, while the sum is 29.

The square root of 72381143 is about 8507.7107966832. The cubic root of 72381143 is about 416.7495558472.

The spelling of 72381143 in words is "seventy-two million, three hundred eighty-one thousand, one hundred forty-three".