172420625 has 20 divisors (see below), whose sum is σ = 232041348. Its totient is φ = 127320000.

The previous prime is 172420609. The next prime is 172420643. The reversal of 172420625 is 526024271.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 117007489 + 55413136 = 10817^2 + 7444^2 .

It is not a de Polignac number, because 172420625 - 2⁴ = 172420609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 2486 + ... + 18735.

Almost surely, 2^172420625 is an apocalyptic number.

It is an amenable number.

172420625 is a deficient number, since it is larger than the sum of its proper divisors (59620723).

172420625 is an equidigital number, since it uses as much as digits as its factorization.

172420625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21254 (or 21239 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 172420625 is about 13130.9034342653. The cubic root of 172420625 is about 556.5827449872.

Adding to 172420625 its reverse (526024271), we get a palindrome (698444896).

The spelling of 172420625 in words is "one hundred seventy-two million, four hundred twenty thousand, six hundred twenty-five".