12400400989 has 2 divisors, whose sum is σ = 12400400990. Its totient is φ = 12400400988.

The previous prime is 12400400983. The next prime is 12400401113. The reversal of 12400400989 is 98900400421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9891893764 + 2508507225 = 99458^2 + 50085^2 .

It is a cyclic number.

It is not a de Polignac number, because 12400400989 - 2⁹ = 12400400477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12400400983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200200494 + 6200200495.

It is an arithmetic number, because the mean of its divisors is an integer number (6200200495).

Almost surely, 2^12400400989 is an apocalyptic number.

It is an amenable number.

12400400989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400400989 is an equidigital number, since it uses as much as digits as its factorization.

12400400989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 12400400989 in words is "twelve billion, four hundred million, four hundred thousand, nine hundred eighty-nine".