128197944 has 64 divisors (see below), whose sum is σ = 406982400. Its totient is φ = 36627552.

The previous prime is 128197931. The next prime is 128197957. The reversal of 128197944 is 449791821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128197931) and next prime (128197957).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 128197944.

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, 40882 + ... + 43905.

It is an arithmetic number, because the mean of its divisors is an integer number (6359100).

Almost surely, 2^128197944 is an apocalyptic number.

128197944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128197944 is an abundant number, since it is smaller than the sum of its proper divisors (278784456).

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

128197944 is a wasteful number, since it uses less digits than its factorization.

128197944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84809 (or 84799 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 128197944 is about 11322.4530910929. The cubic root of 128197944 is about 504.2280713802.

It can be divided in two parts, 1281 and 97944, that added together give a square (99225 = 315²).

The spelling of 128197944 in words is "one hundred twenty-eight million, one hundred ninety-seven thousand, nine hundred forty-four".