638370 has 48 divisors (see below), whose sum is σ = 1710072. Its totient is φ = 165120.

The previous prime is 638359. The next prime is 638371. The reversal of 638370 is 73836.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 488601 + 149769 = 699^2 + 387^2 .

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638370.

It is not an unprimeable number, because it can be changed into a prime (638371) by changing a digit.

638370 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3604 + ... + 3776.

2⁶³⁸³⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (855036).

638370 is an abundant number, since it is smaller than the sum of its proper divisors (1071702).

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

638370 is a wasteful number, since it uses less digits than its factorization.

638370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 638370 is about 798.9806005154. The cubic root of 638370 is about 86.1041643912.

The spelling of 638370 in words is "six hundred thirty-eight thousand, three hundred seventy".