1389944040 has 128 divisors (see below), whose sum is σ = 4312344960. Its totient is φ = 358170624.

The previous prime is 1389943963. The next prime is 1389944047. The reversal of 1389944040 is 404499831.

1389944040 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1389943983 and 1389944001.

It is not an unprimeable number, because it can be changed into a prime (1389944047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499132 + ... + 501908.

It is an arithmetic number, because the mean of its divisors is an integer number (33690195).

Almost surely, 2^1389944040 is an apocalyptic number.

1389944040 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 1389944040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2156172480).

1389944040 is an abundant number, since it is smaller than the sum of its proper divisors (2922400920).

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

1389944040 is a wasteful number, since it uses less digits than its factorization.

1389944040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931 (or 2927 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1389944040 is about 37281.9532750096. The cubic root of 1389944040 is about 1116.0040531192.

The spelling of 1389944040 in words is "one billion, three hundred eighty-nine million, nine hundred forty-four thousand, forty".