438444540 has 36 divisors (see below), whose sum is σ = 1329948984. Its totient is φ = 116918496.

The previous prime is 438444499. The next prime is 438444553. The reversal of 438444540 is 45444834.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×438444540² = 384467229311623200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 438444495 and 438444504.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1217722 + ... + 1218081.

Almost surely, 2^438444540 is an apocalyptic number.

It is an amenable number.

438444540 is an abundant number, since it is smaller than the sum of its proper divisors (891504444).

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

438444540 is a wasteful number, since it uses less digits than its factorization.

438444540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435818 (or 2435813 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 36.

The square root of 438444540 is about 20939.0673144722. The cubic root of 438444540 is about 759.6931702328.

It can be divided in two parts, 43844 and 4540, that added together give a palindrome (48384).

The spelling of 438444540 in words is "four hundred thirty-eight million, four hundred forty-four thousand, five hundred forty".