128012431 has 8 divisors (see below), whose sum is σ = 136294704. Its totient is φ = 119813760.

The previous prime is 128012413. The next prime is 128012447. The reversal of 128012431 is 134210821.

It is a happy number.

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 128012431 - 2⁷ = 128012303 is a prime.

It is a super-2 number, since 2×128012431² = 32774364981059522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128022431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17725 + ... + 23878.

It is an arithmetic number, because the mean of its divisors is an integer number (17036838).

Almost surely, 2^128012431 is an apocalyptic number.

128012431 is a deficient number, since it is larger than the sum of its proper divisors (8282273).

128012431 is a wasteful number, since it uses less digits than its factorization.

128012431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41801.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 128012431 is about 11314.2578634217. The cubic root of 128012431 is about 503.9847340950.

The spelling of 128012431 in words is "one hundred twenty-eight million, twelve thousand, four hundred thirty-one".