72381173 has 4 divisors (see below), whose sum is σ = 72398508. Its totient is φ = 72363840.

The previous prime is 72381167. The next prime is 72381181. The reversal of 72381173 is 37118327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37118327 = 17 ⋅2183431.

It can be written as a sum of positive squares in 2 ways, for example, as 51523684 + 20857489 = 7178^2 + 4567^2 .

It is a cyclic number.

It is not a de Polignac number, because 72381173 - 2¹² = 72377077 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 (72381473) 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, 1853 + ... + 12173.

It is an arithmetic number, because the mean of its divisors is an integer number (18099627).

Almost surely, 2^72381173 is an apocalyptic number.

It is an amenable number.

72381173 is a deficient number, since it is larger than the sum of its proper divisors (17335).

72381173 is a wasteful number, since it uses less digits than its factorization.

72381173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17334.

The product of its digits is 7056, while the sum is 32.

The square root of 72381173 is about 8507.7125597895. The cubic root of 72381173 is about 416.7496134243.

The spelling of 72381173 in words is "seventy-two million, three hundred eighty-one thousand, one hundred seventy-three".