128242317 has 16 divisors (see below), whose sum is σ = 196007552. Its totient is φ = 73059840.

The previous prime is 128242307. The next prime is 128242327. The reversal of 128242317 is 713242821.

It is an interprime number because it is at equal distance from previous prime (128242307) and next prime (128242327).

It is not a de Polignac number, because 128242317 - 2¹⁰ = 128241293 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 (128242307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1984 + ... + 16137.

It is an arithmetic number, because the mean of its divisors is an integer number (12250472).

Almost surely, 2^128242317 is an apocalyptic number.

It is an amenable number.

128242317 is a deficient number, since it is larger than the sum of its proper divisors (67765235).

128242317 is a wasteful number, since it uses less digits than its factorization.

128242317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18468.

The product of its digits is 5376, while the sum is 30.

The square root of 128242317 is about 11324.4124350891. The cubic root of 128242317 is about 504.2862406211.

The spelling of 128242317 in words is "one hundred twenty-eight million, two hundred forty-two thousand, three hundred seventeen".