128242917 has 48 divisors (see below), whose sum is σ = 223337088. Its totient is φ = 69949440.

The previous prime is 128242897. The next prime is 128242921. The reversal of 128242917 is 719242821.

It is not a de Polignac number, because 128242917 - 2⁶ = 128242853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128242937) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37053 + ... + 40365.

It is an arithmetic number, because the mean of its divisors is an integer number (4652856).

Almost surely, 2^128242917 is an apocalyptic number.

128242917 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128242917 is a deficient number, since it is larger than the sum of its proper divisors (95094171).

128242917 is a wasteful number, since it uses less digits than its factorization.

128242917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3370 (or 3367 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 128242917 is about 11324.4389264987. The cubic root of 128242917 is about 504.2870270782.

The spelling of 128242917 in words is "one hundred twenty-eight million, two hundred forty-two thousand, nine hundred seventeen".