128249157 has 8 divisors (see below), whose sum is σ = 171068320. Its totient is φ = 85464720.

The previous prime is 128249137. The next prime is 128249159. The reversal of 128249157 is 751942821.

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

It is not a de Polignac number, because 128249157 - 2²⁰ = 127200581 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 (128249159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1719 + ... + 16107.

It is an arithmetic number, because the mean of its divisors is an integer number (21383540).

Almost surely, 2^128249157 is an apocalyptic number.

It is an amenable number.

128249157 is a deficient number, since it is larger than the sum of its proper divisors (42819163).

128249157 is a wasteful number, since it uses less digits than its factorization.

128249157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17363.

The product of its digits is 40320, while the sum is 39.

The square root of 128249157 is about 11324.7144334857. The cubic root of 128249157 is about 504.2952060875.

The spelling of 128249157 in words is "one hundred twenty-eight million, two hundred forty-nine thousand, one hundred fifty-seven".