128257943 has 18 divisors (see below), whose sum is σ = 145804176. Its totient is φ = 112734600.

The previous prime is 128257939. The next prime is 128257973. The reversal of 128257943 is 349752821.

It is not a de Polignac number, because 128257943 - 2² = 128257939 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 128257943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128257903) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 115730 + ... + 116832.

It is an arithmetic number, because the mean of its divisors is an integer number (8100232).

Almost surely, 2^128257943 is an apocalyptic number.

128257943 is a deficient number, since it is larger than the sum of its proper divisors (17546233).

128257943 is a wasteful number, since it uses less digits than its factorization.

128257943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187 (or 1145 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 128257943 is about 11325.1023394934. The cubic root of 128257943 is about 504.3067217876.

The spelling of 128257943 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, nine hundred forty-three".