128149440 has 112 divisors (see below), whose sum is σ = 410382720. Its totient is φ = 33879040.

The previous prime is 128149423. The next prime is 128149457. The reversal of 128149440 is 44941821.

It is an interprime number because it is at equal distance from previous prime (128149423) and next prime (128149457).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125251 + ... + 126269.

Almost surely, 2^128149440 is an apocalyptic number.

128149440 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 128149440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205191360).

128149440 is an abundant number, since it is smaller than the sum of its proper divisors (282233280).

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

128149440 is a wasteful number, since it uses less digits than its factorization.

128149440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1160 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 128149440 is about 11320.3109497929. The cubic root of 128149440 is about 504.1644713912.

It can be divided in two parts, 1281 and 49440, that added together give a triangular number (50721 = T₃₁₈).

The spelling of 128149440 in words is "one hundred twenty-eight million, one hundred forty-nine thousand, four hundred forty".