1389136944 has 80 divisors (see below), whose sum is σ = 3870050912. Its totient is φ = 426829824.

The previous prime is 1389136937. The next prime is 1389136961. The reversal of 1389136944 is 4496319831.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 1389136893 and 1389136902.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 696012 + ... + 698004.

Almost surely, 2^1389136944 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 1389136944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1935025456).

1389136944 is an abundant number, since it is smaller than the sum of its proper divisors (2480913968).

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

1389136944 is a wasteful number, since it uses less digits than its factorization.

1389136944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134 (or 3128 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 1389136944 is about 37271.1274849581. The cubic root of 1389136944 is about 1115.7880020223.

The spelling of 1389136944 in words is "one billion, three hundred eighty-nine million, one hundred thirty-six thousand, nine hundred forty-four".