1439728040 has 128 divisors (see below), whose sum is σ = 3589401600. Its totient is φ = 517570560.

The previous prime is 1439728019. The next prime is 1439728051. The reversal of 1439728040 is 408279341.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 1439727985 and 1439728003.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1248104 + ... + 1249256.

It is an arithmetic number, because the mean of its divisors is an integer number (28042200).

Almost surely, 2^1439728040 is an apocalyptic number.

1439728040 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 1439728040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1794700800).

1439728040 is an abundant number, since it is smaller than the sum of its proper divisors (2149673560).

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

1439728040 is a wasteful number, since it uses less digits than its factorization.

1439728040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1439728040 is about 37943.7483651787. The cubic root of 1439728040 is about 1129.1721401374.

The spelling of 1439728040 in words is "one billion, four hundred thirty-nine million, seven hundred twenty-eight thousand, forty".