128252473 has 4 divisors (see below), whose sum is σ = 128462308. Its totient is φ = 128042640.

The previous prime is 128252441. The next prime is 128252491. The reversal of 128252473 is 374252821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 374252821 = 67 ⋅5585863.

It can be written as a sum of positive squares in 2 ways, for example, as 8743849 + 119508624 = 2957^2 + 10932^2 .

It is a cyclic number.

It is not a de Polignac number, because 128252473 - 2⁵ = 128252441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128259473) 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, 103998 + ... + 105223.

It is an arithmetic number, because the mean of its divisors is an integer number (32115577).

Almost surely, 2^128252473 is an apocalyptic number.

It is an amenable number.

128252473 is a deficient number, since it is larger than the sum of its proper divisors (209835).

128252473 is an equidigital number, since it uses as much as digits as its factorization.

128252473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209834.

The product of its digits is 26880, while the sum is 34.

The square root of 128252473 is about 11324.8608379971. The cubic root of 128252473 is about 504.2995523889.

The spelling of 128252473 in words is "one hundred twenty-eight million, two hundred fifty-two thousand, four hundred seventy-three".