1405205345 has 4 divisors (see below), whose sum is σ = 1686246420. Its totient is φ = 1124164272.

The previous prime is 1405205323. The next prime is 1405205357. The reversal of 1405205345 is 5435025041.

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 932447296 + 472758049 = 30536^2 + 21743^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405205345 - 2¹⁰ = 1405204321 is a prime.

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, 140520530 + ... + 140520539.

It is an arithmetic number, because the mean of its divisors is an integer number (421561605).

Almost surely, 2^1405205345 is an apocalyptic number.

It is an amenable number.

1405205345 is a deficient number, since it is larger than the sum of its proper divisors (281041075).

1405205345 is an equidigital number, since it uses as much as digits as its factorization.

1405205345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281041074.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 1405205345 is about 37486.0686789106. The cubic root of 1405205345 is about 1120.0736943962.

The spelling of 1405205345 in words is "one billion, four hundred five million, two hundred five thousand, three hundred forty-five".