172808387 has 2 divisors, whose sum is σ = 172808388. Its totient is φ = 172808386.

The previous prime is 172808371. The next prime is 172808393. The reversal of 172808387 is 783808271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172808387 - 2⁴ = 172808371 is a prime.

It is not a weakly prime, because it can be changed into another prime (172807387) 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, 86404193 + 86404194.

It is an arithmetic number, because the mean of its divisors is an integer number (86404194).

Almost surely, 2^172808387 is an apocalyptic number.

172808387 is a deficient number, since it is larger than the sum of its proper divisors (1).

172808387 is an equidigital number, since it uses as much as digits as its factorization.

172808387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 44.

The square root of 172808387 is about 13145.6603866067. The cubic root of 172808387 is about 556.9996712316. Note that the first 3 decimals are identical.

The spelling of 172808387 in words is "one hundred seventy-two million, eight hundred eight thousand, three hundred eighty-seven".