128382869 has 4 divisors (see below), whose sum is σ = 128915820. Its totient is φ = 127849920.

The previous prime is 128382853. The next prime is 128382871. The reversal of 128382869 is 968283821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968283821 = 37 ⋅26169833.

It can be written as a sum of positive squares in 2 ways, for example, as 72880369 + 55502500 = 8537^2 + 7450^2 .

It is a cyclic number.

It is not a de Polignac number, because 128382869 - 2⁴ = 128382853 is a prime.

It is a super-2 number, since 2×128382869² = 32964322105342322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128382809) 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, 266114 + ... + 266595.

It is an arithmetic number, because the mean of its divisors is an integer number (32228955).

Almost surely, 2^128382869 is an apocalyptic number.

It is an amenable number.

128382869 is a deficient number, since it is larger than the sum of its proper divisors (532951).

128382869 is an equidigital number, since it uses as much as digits as its factorization.

128382869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532950.

The product of its digits is 331776, while the sum is 47.

The square root of 128382869 is about 11330.6164439540. The cubic root of 128382869 is about 504.4704038602.

The spelling of 128382869 in words is "one hundred twenty-eight million, three hundred eighty-two thousand, eight hundred sixty-nine".