12731128 has 8 divisors (see below), whose sum is σ = 23870880. Its totient is φ = 6365560.

The previous prime is 12731099. The next prime is 12731129. The reversal of 12731128 is 82113721.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795688 + ... + 795703.

It is an arithmetic number, because the mean of its divisors is an integer number (2983860).

Almost surely, 2^12731128 is an apocalyptic number.

It is an amenable number.

12731128 is a deficient number, since it is larger than the sum of its proper divisors (11139752).

12731128 is a wasteful number, since it uses less digits than its factorization.

12731128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591397 (or 1591393 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 12731128 is about 3568.0706271037. The cubic root of 12731128 is about 233.5011165113.

Adding to 12731128 its reverse (82113721), we get a palindrome (94844849).

It can be divided in two parts, 1273 and 1128, that added together give a 4-th power (2401 = 7⁴).

The spelling of 12731128 in words is "twelve million, seven hundred thirty-one thousand, one hundred twenty-eight".