128940356 has 6 divisors (see below), whose sum is σ = 225645630. Its totient is φ = 64470176.

The previous prime is 128940353. The next prime is 128940373. The reversal of 128940356 is 653049821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 112699456 + 16240900 = 10616^2 + 4030^2 .

It is not an unprimeable number, because it can be changed into a prime (128940353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16117541 + ... + 16117548.

It is an arithmetic number, because the mean of its divisors is an integer number (37607605).

Almost surely, 2^128940356 is an apocalyptic number.

It is an amenable number.

128940356 is a deficient number, since it is larger than the sum of its proper divisors (96705274).

128940356 is a wasteful number, since it uses less digits than its factorization.

128940356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32235093 (or 32235091 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 128940356 is about 11355.1907073373. The cubic root of 128940356 is about 505.1995499323.

The spelling of 128940356 in words is "one hundred twenty-eight million, nine hundred forty thousand, three hundred fifty-six".