438634386 has 64 divisors (see below), whose sum is σ = 993600000. Its totient is φ = 143410176.

The previous prime is 438634373. The next prime is 438634387. The reversal of 438634386 is 683436834.

438634386 is a `hidden beast` number, since 4 + 3 + 8 + 634 + 3 + 8 + 6 = 666.

Its product of digits (995328) is a multiple of the sum of its prime factors (768).

It is not an unprimeable number, because it can be changed into a prime (438634387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 976690 + ... + 977138.

It is an arithmetic number, because the mean of its divisors is an integer number (15525000).

Almost surely, 2^438634386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 438634386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (496800000).

438634386 is an abundant number, since it is smaller than the sum of its proper divisors (554965614).

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

438634386 is a wasteful number, since it uses less digits than its factorization.

438634386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768 (or 762 counting only the distinct ones).

The product of its digits is 995328, while the sum is 45.

The square root of 438634386 is about 20943.6001203232. The cubic root of 438634386 is about 759.8028031777.

The spelling of 438634386 in words is "four hundred thirty-eight million, six hundred thirty-four thousand, three hundred eighty-six".