405887243 has 2 divisors, whose sum is σ = 405887244. Its totient is φ = 405887242.

The previous prime is 405887239. The next prime is 405887263. The reversal of 405887243 is 342788504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405887243 - 2² = 405887239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 405887243.

It is not a weakly prime, because it can be changed into another prime (405887203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202943621 + 202943622.

It is an arithmetic number, because the mean of its divisors is an integer number (202943622).

Almost surely, 2^405887243 is an apocalyptic number.

405887243 is a deficient number, since it is larger than the sum of its proper divisors (1).

405887243 is an equidigital number, since it uses as much as digits as its factorization.

405887243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 215040, while the sum is 41.

The square root of 405887243 is about 20146.6434673372. The cubic root of 405887243 is about 740.4035071088.

The spelling of 405887243 in words is "four hundred five million, eight hundred eighty-seven thousand, two hundred forty-three".