72040231 has 4 divisors (see below), whose sum is σ = 72247000. Its totient is φ = 71833464.

The previous prime is 72040219. The next prime is 72040259. The reversal of 72040231 is 13204027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13204027 = 139 ⋅94993.

It is a cyclic number.

It is not a de Polignac number, because 72040231 - 2⁷ = 72040103 is a prime.

It is a super-2 number, since 2×72040231² = 10379589765066722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72040199 and 72040208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72040261) 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, 102861 + ... + 103558.

It is an arithmetic number, because the mean of its divisors is an integer number (18061750).

Almost surely, 2^72040231 is an apocalyptic number.

72040231 is a deficient number, since it is larger than the sum of its proper divisors (206769).

72040231 is a wasteful number, since it uses less digits than its factorization.

72040231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206768.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 72040231 is about 8487.6516775843. The cubic root of 72040231 is about 416.0942352313.

Adding to 72040231 its reverse (13204027), we get a palindrome (85244258).

The spelling of 72040231 in words is "seventy-two million, forty thousand, two hundred thirty-one".