175440421 has 12 divisors (see below), whose sum is σ = 195115332. Its totient is φ = 157562496.

The previous prime is 175440413. The next prime is 175440451. The reversal of 175440421 is 124044571.

It can be written as a sum of positive squares in 6 ways, for example, as 3568321 + 171872100 = 1889^2 + 13110^2 .

It is not a de Polignac number, because 175440421 - 2³ = 175440413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 175440421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (175440451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7776 + ... + 20281.

It is an arithmetic number, because the mean of its divisors is an integer number (16259611).

Almost surely, 2^175440421 is an apocalyptic number.

It is an amenable number.

175440421 is a deficient number, since it is larger than the sum of its proper divisors (19674911).

175440421 is a wasteful number, since it uses less digits than its factorization.

175440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28120 (or 28107 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 175440421 is about 13245.3924441671. The cubic root of 175440421 is about 559.8133104310.

Adding to 175440421 its reverse (124044571), we get a palindrome (299484992).

The spelling of 175440421 in words is "one hundred seventy-five million, four hundred forty thousand, four hundred twenty-one".