438021 has 8 divisors (see below), whose sum is σ = 648960. Its totient is φ = 291996.

The previous prime is 438017. The next prime is 438029. The reversal of 438021 is 120834.

It is a happy number.

It is not a de Polignac number, because 438021 - 2² = 438017 is a prime.

438021 is a lucky number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 437985 and 438003.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 438021.

It is not an unprimeable number, because it can be changed into a prime (438029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8085 + ... + 8138.

It is an arithmetic number, because the mean of its divisors is an integer number (81120).

2⁴³⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

438021 is a deficient number, since it is larger than the sum of its proper divisors (210939).

438021 is a wasteful number, since it uses less digits than its factorization.

438021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16232 (or 16226 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 438021 is about 661.8315495653. The cubic root of 438021 is about 75.9448468734.

Adding to 438021 its reverse (120834), we get a palindrome (558855).

It can be divided in two parts, 4 and 38021, that added together give a square (38025 = 195²).

The spelling of 438021 in words is "four hundred thirty-eight thousand, twenty-one".