402005543 has 2 divisors, whose sum is σ = 402005544. Its totient is φ = 402005542.

The previous prime is 402005521. The next prime is 402005557. The reversal of 402005543 is 345500204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402005543 - 2¹⁸ = 401743399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402002543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201002771 + 201002772.

It is an arithmetic number, because the mean of its divisors is an integer number (201002772).

Almost surely, 2^402005543 is an apocalyptic number.

402005543 is a deficient number, since it is larger than the sum of its proper divisors (1).

402005543 is an equidigital number, since it uses as much as digits as its factorization.

402005543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 402005543 is about 20050.0758851432. The cubic root of 402005543 is about 738.0356613276.

Adding to 402005543 its reverse (345500204), we get a palindrome (747505747).

The spelling of 402005543 in words is "four hundred two million, five thousand, five hundred forty-three".