438664 has 8 divisors (see below), whose sum is σ = 822510. Its totient is φ = 219328.

The previous prime is 438661. The next prime is 438667. The reversal of 438664 is 466834.

It is an interprime number because it is at equal distance from previous prime (438661) and next prime (438667).

It can be written as a sum of positive squares in only one way, i.e., 372100 + 66564 = 610^2 + 258^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×438664² = 384852209792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27409 + ... + 27424.

2⁴³⁸⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

438664 is a deficient number, since it is larger than the sum of its proper divisors (383846).

438664 is a wasteful number, since it uses less digits than its factorization.

438664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54839 (or 54835 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 438664 is about 662.3171445765. The cubic root of 438664 is about 75.9819901924.

The spelling of 438664 in words is "four hundred thirty-eight thousand, six hundred sixty-four".