1205520385 has 16 divisors (see below), whose sum is σ = 1453800960. Its totient is φ = 959647360.

The previous prime is 1205520377. The next prime is 1205520389. The reversal of 1205520385 is 5830255021.

It is not a de Polignac number, because 1205520385 - 2³ = 1205520377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205520389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1396464 + ... + 1397326.

It is an arithmetic number, because the mean of its divisors is an integer number (90862560).

Almost surely, 2^1205520385 is an apocalyptic number.

It is an amenable number.

1205520385 is a deficient number, since it is larger than the sum of its proper divisors (248280575).

1205520385 is an equidigital number, since it uses as much as digits as its factorization.

1205520385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 1205520385 is about 34720.6046174314. The cubic root of 1205520385 is about 1064.2856002239.

The spelling of 1205520385 in words is "one billion, two hundred five million, five hundred twenty thousand, three hundred eighty-five".