1206404305 has 4 divisors (see below), whose sum is σ = 1447685172. Its totient is φ = 965123440.

The previous prime is 1206404291. The next prime is 1206404341. The reversal of 1206404305 is 5034046021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5034046021 = 523 ⋅9625327.

It can be written as a sum of positive squares in 2 ways, for example, as 824436369 + 381967936 = 28713^2 + 19544^2 .

It is not a de Polignac number, because 1206404305 - 2⁵ = 1206404273 is a prime.

It is a super-2 number, since 2×1206404305² = 2910822694245066050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1206404305.

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, 120640426 + ... + 120640435.

It is an arithmetic number, because the mean of its divisors is an integer number (361921293).

Almost surely, 2^1206404305 is an apocalyptic number.

It is an amenable number.

1206404305 is a deficient number, since it is larger than the sum of its proper divisors (241280867).

1206404305 is an equidigital number, since it uses as much as digits as its factorization.

1206404305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241280866.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1206404305 is about 34733.3313259756. The cubic root of 1206404305 is about 1064.5456576251.

The spelling of 1206404305 in words is "one billion, two hundred six million, four hundred four thousand, three hundred five".