128923140 has 24 divisors (see below), whose sum is σ = 360984960. Its totient is φ = 34379488.

The previous prime is 128923117. The next prime is 128923163. The reversal of 128923140 is 41329821.

It is an interprime number because it is at equal distance from previous prime (128923117) and next prime (128923163).

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 = 128923098 and 128923107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1074300 + ... + 1074419.

It is an arithmetic number, because the mean of its divisors is an integer number (15041040).

Almost surely, 2^128923140 is an apocalyptic number.

128923140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128923140 is an abundant number, since it is smaller than the sum of its proper divisors (232061820).

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

128923140 is a wasteful number, since it uses less digits than its factorization.

128923140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148731 (or 2148729 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 128923140 is about 11354.4326146224. The cubic root of 128923140 is about 505.1770643355.

The spelling of 128923140 in words is "one hundred twenty-eight million, nine hundred twenty-three thousand, one hundred forty".