1439861444 has 48 divisors (see below), whose sum is σ = 3068698752. Its totient is φ = 577055232.

The previous prime is 1439861431. The next prime is 1439861447. The reversal of 1439861444 is 4441689341.

It is a junction number, because it is equal to n+sod(n) for n = 1439861395 and 1439861404.

It is not an unprimeable number, because it can be changed into a prime (1439861447) 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, 65099 + ... + 84365.

It is an arithmetic number, because the mean of its divisors is an integer number (63931224).

Almost surely, 2^1439861444 is an apocalyptic number.

1439861444 is a gapful number since it is divisible by the number (14) 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 1439861444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1534349376).

1439861444 is an abundant number, since it is smaller than the sum of its proper divisors (1628837308).

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

1439861444 is a wasteful number, since it uses less digits than its factorization.

1439861444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19452 (or 19450 counting only the distinct ones).

The product of its digits is 331776, while the sum is 44.

The square root of 1439861444 is about 37945.5062425052. The cubic root of 1439861444 is about 1129.2070151100.

The spelling of 1439861444 in words is "one billion, four hundred thirty-nine million, eight hundred sixty-one thousand, four hundred forty-four".