128932973 has 6 divisors (see below), whose sum is σ = 139613994. Its totient is φ = 119014896.

The previous prime is 128932957. The next prime is 128933023. The reversal of 128932973 is 379239821.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2550409 + 126382564 = 1597^2 + 11242^2 .

It is not a de Polignac number, because 128932973 - 2⁴ = 128932957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128932873) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 381290 + ... + 381627.

It is an arithmetic number, because the mean of its divisors is an integer number (23268999).

Almost surely, 2^128932973 is an apocalyptic number.

128932973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

128932973 is a deficient number, since it is larger than the sum of its proper divisors (10681021).

128932973 is an equidigital number, since it uses as much as digits as its factorization.

128932973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762943 (or 762930 counting only the distinct ones).

The product of its digits is 163296, while the sum is 44.

The square root of 128932973 is about 11354.8656090682. The cubic root of 128932973 is about 505.1899073359.

The spelling of 128932973 in words is "one hundred twenty-eight million, nine hundred thirty-two thousand, nine hundred seventy-three".