402144309989 has 2 divisors, whose sum is σ = 402144309990. Its totient is φ = 402144309988.

The previous prime is 402144309947. The next prime is 402144310039. The reversal of 402144309989 is 989903441204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401269037764 + 875272225 = 633458^2 + 29585^2 .

It is a cyclic number.

It is not a de Polignac number, because 402144309989 - 2²⁴ = 402127532773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402144309989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402144309929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201072154994 + 201072154995.

It is an arithmetic number, because the mean of its divisors is an integer number (201072154995).

Almost surely, 2^402144309989 is an apocalyptic number.

It is an amenable number.

402144309989 is a deficient number, since it is larger than the sum of its proper divisors (1).

402144309989 is an equidigital number, since it uses as much as digits as its factorization.

402144309989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 402144309989 in words is "four hundred two billion, one hundred forty-four million, three hundred nine thousand, nine hundred eighty-nine".