405205243 has 4 divisors (see below), whose sum is σ = 407444128. Its totient is φ = 402966360.

The previous prime is 405205223. The next prime is 405205277. The reversal of 405205243 is 342502504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405205243 - 2¹⁷ = 405074171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405205223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1119171 + ... + 1119532.

It is an arithmetic number, because the mean of its divisors is an integer number (101861032).

Almost surely, 2^405205243 is an apocalyptic number.

405205243 is a deficient number, since it is larger than the sum of its proper divisors (2238885).

405205243 is a wasteful number, since it uses less digits than its factorization.

405205243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238884.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 405205243 is about 20129.7104549469. The cubic root of 405205243 is about 739.9885821223.

Adding to 405205243 its reverse (342502504), we get a palindrome (747707747).

The spelling of 405205243 in words is "four hundred five million, two hundred five thousand, two hundred forty-three".