405981143 has 2 divisors, whose sum is σ = 405981144. Its totient is φ = 405981142.

The previous prime is 405981133. The next prime is 405981197. The reversal of 405981143 is 341189504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405981143 - 2⁴ = 405981127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405981133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202990571 + 202990572.

It is an arithmetic number, because the mean of its divisors is an integer number (202990572).

Almost surely, 2^405981143 is an apocalyptic number.

405981143 is a deficient number, since it is larger than the sum of its proper divisors (1).

405981143 is an equidigital number, since it uses as much as digits as its factorization.

405981143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 405981143 is about 20148.9737455782. The cubic root of 405981143 is about 740.4605989324.

The spelling of 405981143 in words is "four hundred five million, nine hundred eighty-one thousand, one hundred forty-three".