172403949 has 4 divisors (see below), whose sum is σ = 229871936. Its totient is φ = 114935964.

The previous prime is 172403911. The next prime is 172403971. The reversal of 172403949 is 949304271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 172403949 - 2⁷ = 172403821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172403909) 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, 28733989 + ... + 28733994.

It is an arithmetic number, because the mean of its divisors is an integer number (57467984).

Almost surely, 2^172403949 is an apocalyptic number.

It is an amenable number.

172403949 is a deficient number, since it is larger than the sum of its proper divisors (57467987).

172403949 is an equidigital number, since it uses as much as digits as its factorization.

172403949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57467986.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 172403949 is about 13130.2684283300. The cubic root of 172403949 is about 556.5648007436.

The spelling of 172403949 in words is "one hundred seventy-two million, four hundred three thousand, nine hundred forty-nine".