1231797428 has 12 divisors (see below), whose sum is σ = 2171154720. Its totient is φ = 611467512.

The previous prime is 1231797421. The next prime is 1231797517. The reversal of 1231797428 is 8247971321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231797421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1107176 + ... + 1108287.

It is an arithmetic number, because the mean of its divisors is an integer number (180929560).

Almost surely, 2^1231797428 is an apocalyptic number.

It is an amenable number.

1231797428 is a deficient number, since it is larger than the sum of its proper divisors (939357292).

1231797428 is a wasteful number, since it uses less digits than its factorization.

1231797428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215606 (or 2215604 counting only the distinct ones).

The product of its digits is 169344, while the sum is 44.

The square root of 1231797428 is about 35096.9717782033. The cubic root of 1231797428 is about 1071.9629231347.

The spelling of 1231797428 in words is "one billion, two hundred thirty-one million, seven hundred ninety-seven thousand, four hundred twenty-eight".