1386252780 has 384 divisors, whose sum is σ = 4737761280. Its totient is φ = 299228160.

The previous prime is 1386252773. The next prime is 1386252781. The reversal of 1386252780 is 872526831.

1386252780 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1386252781) 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 127 ways as a sum of consecutive naturals, for example, 20690307 + ... + 20690373.

It is an arithmetic number, because the mean of its divisors is an integer number (12337920).

Almost surely, 2^1386252780 is an apocalyptic number.

1386252780 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 1386252780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2368880640).

1386252780 is an abundant number, since it is smaller than the sum of its proper divisors (3351508500).

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

1386252780 is a wasteful number, since it uses less digits than its factorization.

1386252780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 1386252780 is about 37232.4157153414. The cubic root of 1386252780 is about 1115.0152571528.

The spelling of 1386252780 in words is "one billion, three hundred eighty-six million, two hundred fifty-two thousand, seven hundred eighty".