438978 has 16 divisors (see below), whose sum is σ = 916416. Its totient is φ = 139920.

The previous prime is 438967. The next prime is 438979. The reversal of 438978 is 879834.

It is not an unprimeable number, because it can be changed into a prime (438979) by changing a digit.

438978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1453 + ... + 1728.

It is an arithmetic number, because the mean of its divisors is an integer number (57276).

438978 is a Friedman number, since it can be written as 9+(84-8)^3-7, using all its digits and the basic arithmetic operations.

2⁴³⁸⁹⁷⁸ is an apocalyptic number.

438978 is an abundant number, since it is smaller than the sum of its proper divisors (477438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

438978 is a wasteful number, since it uses less digits than its factorization.

438978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209.

The product of its digits is 48384, while the sum is 39.

The square root of 438978 is about 662.5541487305. The cubic root of 438978 is about 76.0001154200. Note that the first 3 decimals are identical.

The spelling of 438978 in words is "four hundred thirty-eight thousand, nine hundred seventy-eight".