1389681020 has 96 divisors (see below), whose sum is σ = 3707805696. Its totient is φ = 425606400.

The previous prime is 1389681017. The next prime is 1389681037. The reversal of 1389681020 is 201869831.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44105 + ... + 68735.

It is an arithmetic number, because the mean of its divisors is an integer number (38622976).

Almost surely, 2^1389681020 is an apocalyptic number.

1389681020 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 1389681020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1853902848).

1389681020 is an abundant number, since it is smaller than the sum of its proper divisors (2318124676).

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

1389681020 is a wasteful number, since it uses less digits than its factorization.

1389681020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24691 (or 24689 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1389681020 is about 37278.4256641828. The cubic root of 1389681020 is about 1115.9336546249.

The spelling of 1389681020 in words is "one billion, three hundred eighty-nine million, six hundred eighty-one thousand, twenty".