72143423 has 4 divisors (see below), whose sum is σ = 78701928. Its totient is φ = 65584920.

The previous prime is 72143413. The next prime is 72143431. The reversal of 72143423 is 32434127.

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 72143423 - 2²⁰ = 71094847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72143392 and 72143401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72143413) 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, 3279236 + ... + 3279257.

It is an arithmetic number, because the mean of its divisors is an integer number (19675482).

Almost surely, 2^72143423 is an apocalyptic number.

72143423 is a deficient number, since it is larger than the sum of its proper divisors (6558505).

72143423 is a wasteful number, since it uses less digits than its factorization.

72143423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6558504.

The product of its digits is 4032, while the sum is 26.

The square root of 72143423 is about 8493.7284510396. The cubic root of 72143423 is about 416.2928146012.

It can be divided in two parts, 721 and 43423, that added together give a palindrome (44144).

The spelling of 72143423 in words is "seventy-two million, one hundred forty-three thousand, four hundred twenty-three".