128943730 has 16 divisors (see below), whose sum is σ = 234230040. Its totient is φ = 51103872.

The previous prime is 128943679. The next prime is 128943751. The reversal of 128943730 is 37349821.

It can be written as a sum of positive squares in 4 ways, for example, as 78092569 + 50851161 = 8837^2 + 7131^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128943730.

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, 58059 + ... + 60238.

Almost surely, 2^128943730 is an apocalyptic number.

128943730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128943730 is a deficient number, since it is larger than the sum of its proper divisors (105286310).

128943730 is a wasteful number, since it uses less digits than its factorization.

128943730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118413.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 128943730 is about 11355.3392727826. The cubic root of 128943730 is about 505.2039564359.

The spelling of 128943730 in words is "one hundred twenty-eight million, nine hundred forty-three thousand, seven hundred thirty".