1439899820 has 48 divisors (see below), whose sum is σ = 3195279360. Its totient is φ = 543930816.

The previous prime is 1439899801. The next prime is 1439899841. The reversal of 1439899820 is 289989341.

It is a super-2 number, since 2×1439899820² = 4146622983272064800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

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, 16529 + ... + 56151.

It is an arithmetic number, because the mean of its divisors is an integer number (66568320).

Almost surely, 2^1439899820 is an apocalyptic number.

1439899820 is a gapful number since it is divisible by the number (10) 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 1439899820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1597639680).

1439899820 is an abundant number, since it is smaller than the sum of its proper divisors (1755379540).

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

1439899820 is a wasteful number, since it uses less digits than its factorization.

1439899820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39734 (or 39732 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 1439899820 is about 37946.0119116621. The cubic root of 1439899820 is about 1129.2170471084.

The spelling of 1439899820 in words is "one billion, four hundred thirty-nine million, eight hundred ninety-nine thousand, eight hundred twenty".