128401340 has 96 divisors (see below), whose sum is σ = 299230848. Its totient is φ = 46080000.

The previous prime is 128401337. The next prime is 128401363. The reversal of 128401340 is 43104821.

It is a super-2 number, since 2×128401340² = 32973808227591200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 850265 + ... + 850415.

It is an arithmetic number, because the mean of its divisors is an integer number (3116988).

Almost surely, 2^128401340 is an apocalyptic number.

128401340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128401340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149615424).

128401340 is an abundant number, since it is smaller than the sum of its proper divisors (170829508).

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

128401340 is a wasteful number, since it uses less digits than its factorization.

128401340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 128401340 is about 11331.4315070957. The cubic root of 128401340 is about 504.4945961481.

The spelling of 128401340 in words is "one hundred twenty-eight million, four hundred one thousand, three hundred forty".