128021469 has 8 divisors (see below), whose sum is σ = 171102432. Its totient is φ = 85144080.

The previous prime is 128021459. The next prime is 128021471. The reversal of 128021469 is 964120821.

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

It is not a de Polignac number, because 128021469 - 2⁹ = 128020957 is a prime.

It is a super-2 number, since 2×128021469² = 32778993049835922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128021459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49419 + ... + 51944.

It is an arithmetic number, because the mean of its divisors is an integer number (21387804).

Almost surely, 2^128021469 is an apocalyptic number.

It is an amenable number.

128021469 is a deficient number, since it is larger than the sum of its proper divisors (43080963).

128021469 is a wasteful number, since it uses less digits than its factorization.

128021469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101787.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 128021469 is about 11314.6572639210. The cubic root of 128021469 is about 503.9965946797.

The spelling of 128021469 in words is "one hundred twenty-eight million, twenty-one thousand, four hundred sixty-nine".