128739401 has 8 divisors (see below), whose sum is σ = 149203584. Its totient is φ = 108793440.

The previous prime is 128739389. The next prime is 128739407. The reversal of 128739401 is 104937821.

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

It is not a de Polignac number, because 128739401 - 2⁶ = 128739337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128739407) 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, 129020 + ... + 130013.

It is an arithmetic number, because the mean of its divisors is an integer number (18650448).

Almost surely, 2^128739401 is an apocalyptic number.

It is an amenable number.

128739401 is a deficient number, since it is larger than the sum of its proper divisors (20464183).

128739401 is an equidigital number, since it uses as much as digits as its factorization.

128739401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259111.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 128739401 is about 11346.3386605548. The cubic root of 128739401 is about 504.9369604021.

The spelling of 128739401 in words is "one hundred twenty-eight million, seven hundred thirty-nine thousand, four hundred one".