405456385 has 4 divisors (see below), whose sum is σ = 486547668. Its totient is φ = 324365104.

The previous prime is 405456377. The next prime is 405456391. The reversal of 405456385 is 583654504.

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 66601921 + 338854464 = 8161^2 + 18408^2 .

It is a cyclic number.

It is not a de Polignac number, because 405456385 - 2³ = 405456377 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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, 40545634 + ... + 40545643.

It is an arithmetic number, because the mean of its divisors is an integer number (121636917).

Almost surely, 2^405456385 is an apocalyptic number.

It is an amenable number.

405456385 is a deficient number, since it is larger than the sum of its proper divisors (81091283).

405456385 is an equidigital number, since it uses as much as digits as its factorization.

405456385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81091282.

The product of its (nonzero) digits is 288000, while the sum is 40.

The square root of 405456385 is about 20135.9475813779. The cubic root of 405456385 is about 740.1414296275.

The spelling of 405456385 in words is "four hundred five million, four hundred fifty-six thousand, three hundred eighty-five".