128839340 has 24 divisors (see below), whose sum is σ = 309214752. Its totient is φ = 44173440.

The previous prime is 128839339. The next prime is 128839349. The reversal of 128839340 is 43938821.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 128839294 and 128839303.

It is not an unprimeable number, because it can be changed into a prime (128839349) 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, 460001 + ... + 460280.

It is an arithmetic number, because the mean of its divisors is an integer number (12883948).

Almost surely, 2^128839340 is an apocalyptic number.

128839340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128839340 is an abundant number, since it is smaller than the sum of its proper divisors (180375412).

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

128839340 is a wasteful number, since it uses less digits than its factorization.

128839340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920297 (or 920295 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 128839340 is about 11350.7418259777. The cubic root of 128839340 is about 505.0675856347.

The spelling of 128839340 in words is "one hundred twenty-eight million, eight hundred thirty-nine thousand, three hundred forty".