128232499 has 4 divisors (see below), whose sum is σ = 128404000. Its totient is φ = 128061000.

The previous prime is 128232487. The next prime is 128232541. The reversal of 128232499 is 994232821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994232821 = 41 ⋅24249581.

It is a cyclic number.

It is not a de Polignac number, because 128232499 - 2¹³ = 128224307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128232409) 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, 84624 + ... + 86125.

It is an arithmetic number, because the mean of its divisors is an integer number (32101000).

Almost surely, 2^128232499 is an apocalyptic number.

128232499 is a deficient number, since it is larger than the sum of its proper divisors (171501).

128232499 is an equidigital number, since it uses as much as digits as its factorization.

128232499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171500.

The product of its digits is 62208, while the sum is 40.

The square root of 128232499 is about 11323.9789385180. The cubic root of 128232499 is about 504.2733712116.

The spelling of 128232499 in words is "one hundred twenty-eight million, two hundred thirty-two thousand, four hundred ninety-nine".