438382561 has 4 divisors (see below), whose sum is σ = 438424624. Its totient is φ = 438340500.

The previous prime is 438382559. The next prime is 438382591. The reversal of 438382561 is 165283834.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165283834 = 2 ⋅82641917.

It is a cyclic number.

It is not a de Polignac number, because 438382561 - 2¹ = 438382559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438382591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7546 + ... + 30556.

It is an arithmetic number, because the mean of its divisors is an integer number (109606156).

Almost surely, 2^438382561 is an apocalyptic number.

It is an amenable number.

438382561 is a deficient number, since it is larger than the sum of its proper divisors (42063).

438382561 is a wasteful number, since it uses less digits than its factorization.

438382561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42062.

The product of its digits is 138240, while the sum is 40.

The square root of 438382561 is about 20937.5872774300. The cubic root of 438382561 is about 759.6573715266.

The spelling of 438382561 in words is "four hundred thirty-eight million, three hundred eighty-two thousand, five hundred sixty-one".