172400303 has 2 divisors, whose sum is σ = 172400304. Its totient is φ = 172400302.

The previous prime is 172400299. The next prime is 172400309. The reversal of 172400303 is 303004271.

It is a weak prime.

It is an emirp because it is prime and its reverse (303004271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172400303 - 2² = 172400299 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172400309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86200151 + 86200152.

It is an arithmetic number, because the mean of its divisors is an integer number (86200152).

Almost surely, 2^172400303 is an apocalyptic number.

172400303 is a deficient number, since it is larger than the sum of its proper divisors (1).

172400303 is an equidigital number, since it uses as much as digits as its factorization.

172400303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 172400303 is about 13130.1295880886. The cubic root of 172400303 is about 556.5608773038.

Adding to 172400303 its reverse (303004271), we get a palindrome (475404574).

The spelling of 172400303 in words is "one hundred seventy-two million, four hundred thousand, three hundred three".