128012429 has 4 divisors (see below), whose sum is σ = 128047680. Its totient is φ = 127977180.

The previous prime is 128012413. The next prime is 128012447. The reversal of 128012429 is 924210821.

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: 924210821 = 373 ⋅2477777.

It is a cyclic number.

It is not a de Polignac number, because 128012429 - 2⁴ = 128012413 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 (128012449) 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, 11459 + ... + 19680.

It is an arithmetic number, because the mean of its divisors is an integer number (32011920).

Almost surely, 2^128012429 is an apocalyptic number.

It is an amenable number.

128012429 is a deficient number, since it is larger than the sum of its proper divisors (35251).

128012429 is an equidigital number, since it uses as much as digits as its factorization.

128012429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35250.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 128012429 is about 11314.2577750377. The cubic root of 128012429 is about 503.9847314703.

The spelling of 128012429 in words is "one hundred twenty-eight million, twelve thousand, four hundred twenty-nine".