438921 has 12 divisors (see below), whose sum is σ = 724672. Its totient is φ = 250776.

The previous prime is 438913. The next prime is 438937. The reversal of 438921 is 129834.

It is not a de Polignac number, because 438921 - 2³ = 438913 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 438921.

It is not an unprimeable number, because it can be changed into a prime (438941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3421 + ... + 3546.

2⁴³⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

438921 is a deficient number, since it is larger than the sum of its proper divisors (285751).

438921 is a wasteful number, since it uses less digits than its factorization.

438921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6980 (or 6977 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 438921 is about 662.5111319819. The cubic root of 438921 is about 75.9968258139.

The spelling of 438921 in words is "four hundred thirty-eight thousand, nine hundred twenty-one".