128503947 has 32 divisors (see below), whose sum is σ = 204744960. Its totient is φ = 70657920.

The previous prime is 128503937. The next prime is 128503957. The reversal of 128503947 is 749305821.

It is an interprime number because it is at equal distance from previous prime (128503937) and next prime (128503957).

It is not a de Polignac number, because 128503947 - 2⁴ = 128503931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (128503937) 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 31 ways as a sum of consecutive naturals, for example, 22773 + ... + 27849.

It is an arithmetic number, because the mean of its divisors is an integer number (6398280).

Almost surely, 2^128503947 is an apocalyptic number.

128503947 is a deficient number, since it is larger than the sum of its proper divisors (76241013).

128503947 is a wasteful number, since it uses less digits than its factorization.

128503947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5163.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 128503947 is about 11335.9581421246. The cubic root of 128503947 is about 504.6289428628.

The spelling of 128503947 in words is "one hundred twenty-eight million, five hundred three thousand, nine hundred forty-seven".