1389667968 has 128 divisors (see below), whose sum is σ = 4417089600. Its totient is φ = 427576320.

The previous prime is 1389667967. The next prime is 1389667973. The reversal of 1389667968 is 8697669831.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×1389667968² = 3862354122570498048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1389667967) 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, 29463 + ... + 60393.

Almost surely, 2^1389667968 is an apocalyptic number.

1389667968 is a gapful number since it is divisible by the number (18) 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 1389667968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2208544800).

1389667968 is an abundant number, since it is smaller than the sum of its proper divisors (3027421632).

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

1389667968 is a wasteful number, since it uses less digits than its factorization.

1389667968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30967 (or 30949 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The square root of 1389667968 is about 37278.2506027308. The cubic root of 1389667968 is about 1115.9301609666.

The spelling of 1389667968 in words is "one billion, three hundred eighty-nine million, six hundred sixty-seven thousand, nine hundred sixty-eight".