1205056387 has 4 divisors (see below), whose sum is σ = 1205780080. Its totient is φ = 1204332696.

The previous prime is 1205056337. The next prime is 1205056427. The reversal of 1205056387 is 7836505021.

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 1205056387 - 2¹¹ = 1205054339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205056337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359343 + ... + 362680.

It is an arithmetic number, because the mean of its divisors is an integer number (301445020).

Almost surely, 2^1205056387 is an apocalyptic number.

1205056387 is a deficient number, since it is larger than the sum of its proper divisors (723693).

1205056387 is an equidigital number, since it uses as much as digits as its factorization.

1205056387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723692.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 1205056387 is about 34713.9220918640. The cubic root of 1205056387 is about 1064.1490368591.

The spelling of 1205056387 in words is "one billion, two hundred five million, fifty-six thousand, three hundred eighty-seven".