172426477 has 4 divisors (see below), whose sum is σ = 172687996. Its totient is φ = 172164960.

The previous prime is 172426459. The next prime is 172426481. The reversal of 172426477 is 774624271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 774624271 = 71 ⋅10910201.

It can be written as a sum of positive squares in 2 ways, for example, as 102637161 + 69789316 = 10131^2 + 8354^2 .

It is a cyclic number.

It is not a de Polignac number, because 172426477 - 2¹⁹ = 171902189 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172426487) 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, 129768 + ... + 131089.

It is an arithmetic number, because the mean of its divisors is an integer number (43171999).

Almost surely, 2^172426477 is an apocalyptic number.

It is an amenable number.

172426477 is a deficient number, since it is larger than the sum of its proper divisors (261519).

172426477 is an equidigital number, since it uses as much as digits as its factorization.

172426477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261518.

The product of its digits is 131712, while the sum is 40.

The square root of 172426477 is about 13131.1262654808. The cubic root of 172426477 is about 556.5890417694.

The spelling of 172426477 in words is "one hundred seventy-two million, four hundred twenty-six thousand, four hundred seventy-seven".