128311492 has 6 divisors (see below), whose sum is σ = 224545118. Its totient is φ = 64155744.

The previous prime is 128311471. The next prime is 128311501. The reversal of 128311492 is 294113821.

It can be written as a sum of positive squares in only one way, i.e., 117852736 + 10458756 = 10856^2 + 3234^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16038933 + ... + 16038940.

Almost surely, 2^128311492 is an apocalyptic number.

It is an amenable number.

128311492 is a deficient number, since it is larger than the sum of its proper divisors (96233626).

128311492 is a wasteful number, since it uses less digits than its factorization.

128311492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32077877 (or 32077875 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 128311492 is about 11327.4662656748. The cubic root of 128311492 is about 504.3768964232.

The spelling of 128311492 in words is "one hundred twenty-eight million, three hundred eleven thousand, four hundred ninety-two".