72919387 has 2 divisors, whose sum is σ = 72919388. Its totient is φ = 72919386.

The previous prime is 72919373. The next prime is 72919393. The reversal of 72919387 is 78391927.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78391927) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72919387 - 2²³ = 64530779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72919337) 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 as a sum of consecutive naturals, namely, 36459693 + 36459694.

It is an arithmetic number, because the mean of its divisors is an integer number (36459694).

Almost surely, 2^72919387 is an apocalyptic number.

72919387 is a deficient number, since it is larger than the sum of its proper divisors (1).

72919387 is an equidigital number, since it uses as much as digits as its factorization.

72919387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 72919387 is about 8539.2849232240. The cubic root of 72919387 is about 417.7800232173.

The spelling of 72919387 in words is "seventy-two million, nine hundred nineteen thousand, three hundred eighty-seven".