1389419040 has 96 divisors (see below), whose sum is σ = 4406270400. Its totient is φ = 368006144.

The previous prime is 1389419033. The next prime is 1389419047. The reversal of 1389419040 is 409149831.

It is an interprime number because it is at equal distance from previous prime (1389419033) and next prime (1389419047).

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 1389419040.

It is not an unprimeable number, because it can be changed into a prime (1389419047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61807 + ... + 81233.

It is an arithmetic number, because the mean of its divisors is an integer number (45898650).

Almost surely, 2^1389419040 is an apocalyptic number.

1389419040 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 1389419040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2203135200).

1389419040 is an abundant number, since it is smaller than the sum of its proper divisors (3016851360).

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

1389419040 is a wasteful number, since it uses less digits than its factorization.

1389419040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19594 (or 19586 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 1389419040 is about 37274.9116699155. The cubic root of 1389419040 is about 1115.8635256605.

The spelling of 1389419040 in words is "one billion, three hundred eighty-nine million, four hundred nineteen thousand, forty".