128330405 has 8 divisors (see below), whose sum is σ = 175996032. Its totient is φ = 87997968.

The previous prime is 128330381. The next prime is 128330407. The reversal of 128330405 is 504033821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128330405 - 2⁶ = 128330341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128330407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1833257 + ... + 1833326.

It is an arithmetic number, because the mean of its divisors is an integer number (21999504).

Almost surely, 2^128330405 is an apocalyptic number.

It is an amenable number.

128330405 is a deficient number, since it is larger than the sum of its proper divisors (47665627).

128330405 is an equidigital number, since it uses as much as digits as its factorization.

128330405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666595.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 128330405 is about 11328.3010641490. The cubic root of 128330405 is about 504.4016767746.

The spelling of 128330405 in words is "one hundred twenty-eight million, three hundred thirty thousand, four hundred five".