1386828378 has 80 divisors (see below), whose sum is σ = 3492187776. Its totient is φ = 408149280.

The previous prime is 1386828371. The next prime is 1386828383. The reversal of 1386828378 is 8738286831.

It is a super-2 number, since 2×1386828378² = 3846585900052221768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (3096576) is a multiple of the sum of its prime divisors (28672).

It is not an unprimeable number, because it can be changed into a prime (1386828371) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 34123 + ... + 62753.

Almost surely, 2^1386828378 is an apocalyptic number.

1386828378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1386828378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1746093888).

1386828378 is an abundant number, since it is smaller than the sum of its proper divisors (2105359398).

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

1386828378 is a wasteful number, since it uses less digits than its factorization.

1386828378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28681 (or 28672 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 1386828378 is about 37240.1447097081. The cubic root of 1386828378 is about 1115.1695608393.

The spelling of 1386828378 in words is "one billion, three hundred eighty-six million, eight hundred twenty-eight thousand, three hundred seventy-eight".