1389404016 has 840 divisors, whose sum is σ = 5840344944. Its totient is φ = 313528320.

The previous prime is 1389403997. The next prime is 1389404017. The reversal of 1389404016 is 6104049831.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389404017) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 81729640 + ... + 81729656.

Almost surely, 2^1389404016 is an apocalyptic number.

1389404016 is a gapful number since it is divisible by the number (16) 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 1389404016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2920172472).

1389404016 is an abundant number, since it is smaller than the sum of its proper divisors (4450940928).

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

1389404016 is a wasteful number, since it uses less digits than its factorization.

1389404016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1389404016 is about 37274.7101397181. The cubic root of 1389404016 is about 1115.8595036452.

The spelling of 1389404016 in words is "one billion, three hundred eighty-nine million, four hundred four thousand, sixteen".