128238413 has 4 divisors (see below), whose sum is σ = 132375168. Its totient is φ = 124101660.

The previous prime is 128238401. The next prime is 128238421. The reversal of 128238413 is 314832821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 314832821 = 569 ⋅553309.

It is a cyclic number.

It is not a de Polignac number, because 128238413 - 2¹⁸ = 127976269 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 128238413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128238613) 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, 2068331 + ... + 2068392.

It is an arithmetic number, because the mean of its divisors is an integer number (33093792).

Almost surely, 2^128238413 is an apocalyptic number.

It is an amenable number.

128238413 is a deficient number, since it is larger than the sum of its proper divisors (4136755).

128238413 is an equidigital number, since it uses as much as digits as its factorization.

128238413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4136754.

The product of its digits is 9216, while the sum is 32.

The square root of 128238413 is about 11324.2400628033. The cubic root of 128238413 is about 504.2811233464.

The spelling of 128238413 in words is "one hundred twenty-eight million, two hundred thirty-eight thousand, four hundred thirteen".