1389251136 has 336 divisors, whose sum is σ = 4744614336. Its totient is φ = 355332096.

The previous prime is 1389251131. The next prime is 1389251137. The reversal of 1389251136 is 6311529831.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1389251094 and 1389251103.

It is not an unprimeable number, because it can be changed into a prime (1389251131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4525095 + ... + 4525401.

It is an arithmetic number, because the mean of its divisors is an integer number (14120876).

Almost surely, 2^1389251136 is an apocalyptic number.

1389251136 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 1389251136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2372307168).

1389251136 is an abundant number, since it is smaller than the sum of its proper divisors (3355363200).

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

1389251136 is a wasteful number, since it uses less digits than its factorization.

1389251136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 369 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 1389251136 is about 37272.6593631310. The cubic root of 1389251136 is about 1115.8185750993.

The spelling of 1389251136 in words is "one billion, three hundred eighty-nine million, two hundred fifty-one thousand, one hundred thirty-six".