128841240 has 64 divisors (see below), whose sum is σ = 421666560. Its totient is φ = 31233920.

The previous prime is 128841233. The next prime is 128841247. The reversal of 128841240 is 42148821.

It is an interprime number because it is at equal distance from previous prime (128841233) and next prime (128841247).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 128841198 and 128841207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128841247) 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, 47484 + ... + 50123.

It is an arithmetic number, because the mean of its divisors is an integer number (6588540).

Almost surely, 2^128841240 is an apocalyptic number.

128841240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128841240 is an abundant number, since it is smaller than the sum of its proper divisors (292825320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128841240 is a wasteful number, since it uses less digits than its factorization.

128841240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97632 (or 97628 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 128841240 is about 11350.8255206395. The cubic root of 128841240 is about 505.0700683745.

The spelling of 128841240 in words is "one hundred twenty-eight million, eight hundred forty-one thousand, two hundred forty".