405992243 has 4 divisors (see below), whose sum is σ = 413652528. Its totient is φ = 398331960.

The previous prime is 405992233. The next prime is 405992261. The reversal of 405992243 is 342299504.

It is a happy number.

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 405992243 - 2⁶ = 405992179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405992197 and 405992206.

It is not an unprimeable number, because it can be changed into a prime (405992233) 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, 3830063 + ... + 3830168.

It is an arithmetic number, because the mean of its divisors is an integer number (103413132).

Almost surely, 2^405992243 is an apocalyptic number.

405992243 is a deficient number, since it is larger than the sum of its proper divisors (7660285).

405992243 is an equidigital number, since it uses as much as digits as its factorization.

405992243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7660284.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 405992243 is about 20149.2491919674. The cubic root of 405992243 is about 740.4673472243.

The spelling of 405992243 in words is "four hundred five million, nine hundred ninety-two thousand, two hundred forty-three".