438389540 has 24 divisors (see below), whose sum is σ = 974772792. Its totient is φ = 165040640.

The previous prime is 438389537. The next prime is 438389543. The reversal of 438389540 is 45983834.

It is an interprime number because it is at equal distance from previous prime (438389537) and next prime (438389543).

It can be written as a sum of positive squares in 4 ways, for example, as 239692324 + 198697216 = 15482^2 + 14096^2 .

It is a junction number, because it is equal to n+sod(n) for n = 438389491 and 438389500.

It is not an unprimeable number, because it can be changed into a prime (438389543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644351 + ... + 645030.

It is an arithmetic number, because the mean of its divisors is an integer number (40615533).

Almost surely, 2^438389540 is an apocalyptic number.

It is an amenable number.

438389540 is an abundant number, since it is smaller than the sum of its proper divisors (536383252).

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

438389540 is a wasteful number, since it uses less digits than its factorization.

438389540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289407 (or 1289405 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 438389540 is about 20937.7539387586. The cubic root of 438389540 is about 759.6614027246.

The spelling of 438389540 in words is "four hundred thirty-eight million, three hundred eighty-nine thousand, five hundred forty".