402144411989 has 2 divisors, whose sum is σ = 402144411990. Its totient is φ = 402144411988.

The previous prime is 402144411919. The next prime is 402144412003. The reversal of 402144411989 is 989114441204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400762431364 + 1381980625 = 633058^2 + 37175^2 .

It is a cyclic number.

It is not a de Polignac number, because 402144411989 - 2¹⁶ = 402144346453 is a prime.

It is a super-2 number, since 2×402144411989² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402144411919) 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, 201072205994 + 201072205995.

It is an arithmetic number, because the mean of its divisors is an integer number (201072205995).

Almost surely, 2^402144411989 is an apocalyptic number.

It is an amenable number.

402144411989 is a deficient number, since it is larger than the sum of its proper divisors (1).

402144411989 is an equidigital number, since it uses as much as digits as its factorization.

402144411989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 402144411989 in words is "four hundred two billion, one hundred forty-four million, four hundred eleven thousand, nine hundred eighty-nine".