128936401 has 4 divisors (see below), whose sum is σ = 140657904. Its totient is φ = 117214900.

The previous prime is 128936393. The next prime is 128936443. The reversal of 128936401 is 104639821.

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.

It is not a de Polignac number, because 128936401 - 2³ = 128936393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128936461) 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 3 ways as a sum of consecutive naturals, for example, 5860735 + ... + 5860756.

It is an arithmetic number, because the mean of its divisors is an integer number (35164476).

Almost surely, 2^128936401 is an apocalyptic number.

128936401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128936401 is a deficient number, since it is larger than the sum of its proper divisors (11721503).

128936401 is a wasteful number, since it uses less digits than its factorization.

128936401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11721502.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 128936401 is about 11355.0165565709. The cubic root of 128936401 is about 505.1943845347.

The spelling of 128936401 in words is "one hundred twenty-eight million, nine hundred thirty-six thousand, four hundred one".