1389324977784 has 96 divisors (see below), whose sum is σ = 3792072810240. Its totient is φ = 459503308800.

The previous prime is 1389324977779. The next prime is 1389324977863. The reversal of 1389324977784 is 4877794239831.

1389324977784 is a `hidden beast` number, since 1 + 38 + 9 + 32 + 497 + 7 + 78 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20789544 + ... + 20856264.

It is an arithmetic number, because the mean of its divisors is an integer number (39500758440).

Almost surely, 2^{1389324977784} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389324977784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1896036405120).

1389324977784 is an abundant number, since it is smaller than the sum of its proper divisors (2402747832456).

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

1389324977784 is a wasteful number, since it uses less digits than its factorization.

1389324977784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68981 (or 68974 counting only the distinct ones).

The product of its digits is 512096256, while the sum is 72.

The spelling of 1389324977784 in words is "one trillion, three hundred eighty-nine billion, three hundred twenty-four million, nine hundred seventy-seven thousand, seven hundred eighty-four".