1438389520 has 40 divisors (see below), whose sum is σ = 3381848280. Its totient is φ = 568888320.

The previous prime is 1438389451. The next prime is 1438389583. The reversal of 1438389520 is 259838341.

It can be written as a sum of positive squares in 4 ways, for example, as 31539456 + 1406850064 = 5616^2 + 37508^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1438389520² = 4137928822491660800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93891 + ... + 108130.

It is an arithmetic number, because the mean of its divisors is an integer number (84546207).

Almost surely, 2^1438389520 is an apocalyptic number.

1438389520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438389520 is an abundant number, since it is smaller than the sum of its proper divisors (1943458760).

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

1438389520 is a wasteful number, since it uses less digits than its factorization.

1438389520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202123 (or 202117 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 1438389520 is about 37926.1060484727. The cubic root of 1438389520 is about 1128.8220999252.

The spelling of 1438389520 in words is "one billion, four hundred thirty-eight million, three hundred eighty-nine thousand, five hundred twenty".