1205204649 has 24 divisors (see below), whose sum is σ = 1827228480. Its totient is φ = 705233760.

The previous prime is 1205204621. The next prime is 1205204653. The reversal of 1205204649 is 9464025021.

It is not a de Polignac number, because 1205204649 - 2⁵ = 1205204617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1205204659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46717 + ... + 67770.

It is an arithmetic number, because the mean of its divisors is an integer number (76134520).

Almost surely, 2^1205204649 is an apocalyptic number.

It is an amenable number.

1205204649 is a deficient number, since it is larger than the sum of its proper divisors (622023831).

1205204649 is a wasteful number, since it uses less digits than its factorization.

1205204649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114541 (or 114530 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1205204649 is about 34716.0575094581. The cubic root of 1205204649 is about 1064.1926769731.

The spelling of 1205204649 in words is "one billion, two hundred five million, two hundred four thousand, six hundred forty-nine".