128509846 has 12 divisors (see below), whose sum is σ = 199643652. Its totient is φ = 62038424.

The previous prime is 128509841. The next prime is 128509861. The reversal of 128509846 is 648905821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128509841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36520 + ... + 39883.

It is an arithmetic number, because the mean of its divisors is an integer number (16636971).

Almost surely, 2^128509846 is an apocalyptic number.

128509846 is a deficient number, since it is larger than the sum of its proper divisors (71133806).

128509846 is an equidigital number, since it uses as much as digits as its factorization.

128509846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76463 (or 76434 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 128509846 is about 11336.2183288785. The cubic root of 128509846 is about 504.6366644429.

The spelling of 128509846 in words is "one hundred twenty-eight million, five hundred nine thousand, eight hundred forty-six".