402421442389 has 2 divisors, whose sum is σ = 402421442390. Its totient is φ = 402421442388.

The previous prime is 402421442383. The next prime is 402421442393. The reversal of 402421442389 is 983244124204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 302791570225 + 99629872164 = 550265^2 + 315642^2 .

It is a cyclic number.

It is not a de Polignac number, because 402421442389 - 2¹¹ = 402421440341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402421442383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201210721194 + 201210721195.

It is an arithmetic number, because the mean of its divisors is an integer number (201210721195).

Almost surely, 2^402421442389 is an apocalyptic number.

It is an amenable number.

402421442389 is a deficient number, since it is larger than the sum of its proper divisors (1).

402421442389 is an equidigital number, since it uses as much as digits as its factorization.

402421442389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 43.

The spelling of 402421442389 in words is "four hundred two billion, four hundred twenty-one million, four hundred forty-two thousand, three hundred eighty-nine".