438163540 has 12 divisors (see below), whose sum is σ = 920143476. Its totient is φ = 175265408.

The previous prime is 438163513. The next prime is 438163591. The reversal of 438163540 is 45361834.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 186814224 + 251349316 = 13668^2 + 15854^2 .

It is a junction number, because it is equal to n+sod(n) for n = 438163496 and 438163505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10954069 + ... + 10954108.

It is an arithmetic number, because the mean of its divisors is an integer number (76678623).

Almost surely, 2^438163540 is an apocalyptic number.

It is an amenable number.

438163540 is an abundant number, since it is smaller than the sum of its proper divisors (481979936).

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

438163540 is a wasteful number, since it uses less digits than its factorization.

438163540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21908186 (or 21908184 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 438163540 is about 20932.3562935471. The cubic root of 438163540 is about 759.5308392477.

The spelling of 438163540 in words is "four hundred thirty-eight million, one hundred sixty-three thousand, five hundred forty".