128417849 has 12 divisors (see below), whose sum is σ = 148608576. Its totient is φ = 108705432.

The previous prime is 128417819. The next prime is 128417851. The reversal of 128417849 is 948714821.

It is not a de Polignac number, because 128417849 - 2¹⁶ = 128352313 is a prime.

It is a super-2 number, since 2×128417849² = 32982287883573602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128417819) 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 11 ways as a sum of consecutive naturals, for example, 46892 + ... + 49554.

It is an arithmetic number, because the mean of its divisors is an integer number (12384048).

Almost surely, 2^128417849 is an apocalyptic number.

It is an amenable number.

128417849 is a deficient number, since it is larger than the sum of its proper divisors (20190727).

128417849 is an frugal number, since it uses more digits than its factorization.

128417849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2836 (or 2753 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 128417849 is about 11332.1599441589. The cubic root of 128417849 is about 504.5162167542.

The spelling of 128417849 in words is "one hundred twenty-eight million, four hundred seventeen thousand, eight hundred forty-nine".