72143441 has 4 divisors (see below), whose sum is σ = 73504692. Its totient is φ = 70782192.

The previous prime is 72143431. The next prime is 72143447. The reversal of 72143441 is 14434127.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48094225 + 24049216 = 6935^2 + 4904^2 .

It is a cyclic number.

It is not a de Polignac number, because 72143441 - 2²² = 67949137 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 72143441.

It is not an unprimeable number, because it can be changed into a prime (72143447) 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 3 ways as a sum of consecutive naturals, for example, 680546 + ... + 680651.

It is an arithmetic number, because the mean of its divisors is an integer number (18376173).

Almost surely, 2^72143441 is an apocalyptic number.

It is an amenable number.

72143441 is a deficient number, since it is larger than the sum of its proper divisors (1361251).

72143441 is a wasteful number, since it uses less digits than its factorization.

72143441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361250.

The product of its digits is 2688, while the sum is 26.

The square root of 72143441 is about 8493.7295106449. The cubic root of 72143441 is about 416.2928492233.

Adding to 72143441 its reverse (14434127), we get a palindrome (86577568).

The spelling of 72143441 in words is "seventy-two million, one hundred forty-three thousand, four hundred forty-one".