1385205780 has 96 divisors (see below), whose sum is σ = 4439070720. Its totient is φ = 316160640.

The previous prime is 1385205743. The next prime is 1385205803. The reversal of 1385205780 is 875025831.

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, 350415 + ... + 354345.

It is an arithmetic number, because the mean of its divisors is an integer number (46240320).

Almost surely, 2^1385205780 is an apocalyptic number.

1385205780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1385205780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2219535360).

1385205780 is an abundant number, since it is smaller than the sum of its proper divisors (3053864940).

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

1385205780 is a wasteful number, since it uses less digits than its factorization.

1385205780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4789 (or 4787 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 1385205780 is about 37218.3527308773. The cubic root of 1385205780 is about 1114.7344726230.

The spelling of 1385205780 in words is "one billion, three hundred eighty-five million, two hundred five thousand, seven hundred eighty".