1389723264 has 128 divisors (see below), whose sum is σ = 4116312000. Its totient is φ = 461583360.

The previous prime is 1389723263. The next prime is 1389723271. The reversal of 1389723264 is 4623279831.

1389723264 is a `hidden beast` number, since 1 + 389 + 7 + 2 + 3 + 264 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1389723263) 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, 1309294 + ... + 1310354.

Almost surely, 2^1389723264 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 1389723264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2058156000).

1389723264 is an abundant number, since it is smaller than the sum of its proper divisors (2726588736).

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

1389723264 is a wasteful number, since it uses less digits than its factorization.

1389723264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463 (or 1445 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 1389723264 is about 37278.9922610577. The cubic root of 1389723264 is about 1115.9449620215.

The spelling of 1389723264 in words is "one billion, three hundred eighty-nine million, seven hundred twenty-three thousand, two hundred sixty-four".