1386039820 has 24 divisors (see below), whose sum is σ = 3175291728. Its totient is φ = 504014400.

The previous prime is 1386039793. The next prime is 1386039827. The reversal of 1386039820 is 289306831.

It is a super-2 number, since 2×1386039820² = 3842212765251264800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1386039827) 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 7 ways as a sum of consecutive naturals, for example, 3149871 + ... + 3150310.

It is an arithmetic number, because the mean of its divisors is an integer number (132303822).

Almost surely, 2^1386039820 is an apocalyptic number.

1386039820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1386039820 is an abundant number, since it is smaller than the sum of its proper divisors (1789251908).

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

1386039820 is a wasteful number, since it uses less digits than its factorization.

1386039820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6300201 (or 6300199 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1386039820 is about 37229.5557319719. Note that the first 3 decimals coincide. The cubic root of 1386039820 is about 1114.9581569825.

The spelling of 1386039820 in words is "one billion, three hundred eighty-six million, thirty-nine thousand, eight hundred twenty".