1205747511990 has 64 divisors (see below), whose sum is σ = 3310123138560. Its totient is φ = 275355267840.

The previous prime is 1205747511989. The next prime is 1205747512003. The reversal of 1205747511990 is 991157475021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2305716 + ... + 2779895.

It is an arithmetic number, because the mean of its divisors is an integer number (51720674040).

Almost surely, 2^{1205747511990} is an apocalyptic number.

1205747511990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1205747511990 is an abundant number, since it is smaller than the sum of its proper divisors (2104375626570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1205747511990 is a wasteful number, since it uses less digits than its factorization.

1205747511990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5086757.

The product of its (nonzero) digits is 793800, while the sum is 51.

The spelling of 1205747511990 in words is "one trillion, two hundred five billion, seven hundred forty-seven million, five hundred eleven thousand, nine hundred ninety".