1328431837 has 2 divisors, whose sum is σ = 1328431838. Its totient is φ = 1328431836.

The previous prime is 1328431817. The next prime is 1328431877. The reversal of 1328431837 is 7381348231.

It is a happy number.

It is an a-pointer prime, because the next prime (1328431877) can be obtained adding 1328431837 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1316673796 + 11758041 = 36286^2 + 3429^2 .

It is a cyclic number.

It is not a de Polignac number, because 1328431837 - 2²³ = 1320043229 is a prime.

It is a super-2 number, since 2×1328431837² = 3529462291110389138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1328431837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1328431817) 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 as a sum of consecutive naturals, namely, 664215918 + 664215919.

It is an arithmetic number, because the mean of its divisors is an integer number (664215919).

Almost surely, 2^1328431837 is an apocalyptic number.

It is an amenable number.

1328431837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328431837 is an equidigital number, since it uses as much as digits as its factorization.

1328431837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 1328431837 is about 36447.6588685748. The cubic root of 1328431837 is about 1099.2920615623.

The spelling of 1328431837 in words is "one billion, three hundred twenty-eight million, four hundred thirty-one thousand, eight hundred thirty-seven".