1389937920 has 432 divisors, whose sum is σ = 5284802880. Its totient is φ = 310345728.

The previous prime is 1389937919. The next prime is 1389937921. The reversal of 1389937920 is 297399831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1389937919) and next prime (1389937921).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389937921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15617236 + ... + 15617324.

It is an arithmetic number, because the mean of its divisors is an integer number (12233340).

Almost surely, 2^1389937920 is an apocalyptic number.

1389937920 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 1389937920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2642401440).

1389937920 is an abundant number, since it is smaller than the sum of its proper divisors (3894864960).

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

1389937920 is an equidigital number, since it uses as much as digits as its factorization.

1389937920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 1389937920 is about 37281.8711976746. The cubic root of 1389937920 is about 1116.0024151744.

The spelling of 1389937920 in words is "one billion, three hundred eighty-nine million, nine hundred thirty-seven thousand, nine hundred twenty".