438675821 has 4 divisors (see below), whose sum is σ = 439723200. Its totient is φ = 437628444.

The previous prime is 438675793. The next prime is 438675883. The reversal of 438675821 is 128576834.

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.

It is a cyclic number.

It is not a de Polignac number, because 438675821 - 2¹⁴ = 438659437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438645821) 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, 523061 + ... + 523898.

It is an arithmetic number, because the mean of its divisors is an integer number (109930800).

Almost surely, 2^438675821 is an apocalyptic number.

It is an amenable number.

438675821 is a deficient number, since it is larger than the sum of its proper divisors (1047379).

438675821 is a wasteful number, since it uses less digits than its factorization.

438675821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047378.

The product of its digits is 322560, while the sum is 44.

The square root of 438675821 is about 20944.5893012969. The cubic root of 438675821 is about 759.8267270034.

The spelling of 438675821 in words is "four hundred thirty-eight million, six hundred seventy-five thousand, eight hundred twenty-one".