72400223 has 4 divisors (see below), whose sum is σ = 82743120. Its totient is φ = 62057328.

The previous prime is 72400213. The next prime is 72400243. The reversal of 72400223 is 32200427.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32200427 = 7 ⋅4600061.

It is a cyclic number.

It is not a de Polignac number, because 72400223 - 2⁸ = 72399967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72400195 and 72400204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72400213) 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, 5171438 + ... + 5171451.

It is an arithmetic number, because the mean of its divisors is an integer number (20685780).

Almost surely, 2^72400223 is an apocalyptic number.

72400223 is a deficient number, since it is larger than the sum of its proper divisors (10342897).

72400223 is a wasteful number, since it uses less digits than its factorization.

72400223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10342896.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 72400223 is about 8508.8320585143. The cubic root of 72400223 is about 416.7861716590.

The spelling of 72400223 in words is "seventy-two million, four hundred thousand, two hundred twenty-three".