128942417 has 8 divisors (see below), whose sum is σ = 139040160. Its totient is φ = 119175840.

The previous prime is 128942353. The next prime is 128942419. The reversal of 128942417 is 714249821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128942417 - 2⁶ = 128942353 is a prime.

It is a super-2 number, since 2×128942417² = 33252293803603778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128942419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81983 + ... + 83540.

It is an arithmetic number, because the mean of its divisors is an integer number (17380020).

Almost surely, 2^128942417 is an apocalyptic number.

It is an amenable number.

128942417 is a deficient number, since it is larger than the sum of its proper divisors (10097743).

128942417 is a wasteful number, since it uses less digits than its factorization.

128942417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165583.

The product of its digits is 32256, while the sum is 38.

The square root of 128942417 is about 11355.2814584228. The cubic root of 128942417 is about 505.2022416439.

The spelling of 128942417 in words is "one hundred twenty-eight million, nine hundred forty-two thousand, four hundred seventeen".