438493986 has 96 divisors (see below), whose sum is σ = 1145010048. Its totient is φ = 123171840.

The previous prime is 438493981. The next prime is 438493997. The reversal of 438493986 is 689394834.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438493981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 206466 + ... + 208578.

It is an arithmetic number, because the mean of its divisors is an integer number (11927188).

Almost surely, 2^438493986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 438493986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (572505024).

438493986 is an abundant number, since it is smaller than the sum of its proper divisors (706516062).

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

438493986 is a wasteful number, since it uses less digits than its factorization.

438493986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198 (or 2186 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 438493986 is about 20940.2479928008. The cubic root of 438493986 is about 759.7217275326.

The spelling of 438493986 in words is "four hundred thirty-eight million, four hundred ninety-three thousand, nine hundred eighty-six".