405422845 has 4 divisors (see below), whose sum is σ = 486507420. Its totient is φ = 324338272.

The previous prime is 405422839. The next prime is 405422881. The reversal of 405422845 is 548224504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 266701561 + 138721284 = 16331^2 + 11778^2 .

It is a cyclic number.

It is not a de Polignac number, because 405422845 - 2⁹ = 405422333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 405422845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40542280 + ... + 40542289.

It is an arithmetic number, because the mean of its divisors is an integer number (121626855).

Almost surely, 2^405422845 is an apocalyptic number.

It is an amenable number.

405422845 is a deficient number, since it is larger than the sum of its proper divisors (81084575).

405422845 is an equidigital number, since it uses as much as digits as its factorization.

405422845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81084574.

The product of its (nonzero) digits is 51200, while the sum is 34.

The square root of 405422845 is about 20135.1147252753. The cubic root of 405422845 is about 740.1210205041.

The spelling of 405422845 in words is "four hundred five million, four hundred twenty-two thousand, eight hundred forty-five".