638190 has 48 divisors (see below), whose sum is σ = 1898208. Its totient is φ = 145728.

The previous prime is 638179. The next prime is 638201. The reversal of 638190 is 91836.

It is an interprime number because it is at equal distance from previous prime (638179) and next prime (638201).

It is a super-2 number, since 2×638190² = 814572952200, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124 + ... + 1136.

It is an arithmetic number, because the mean of its divisors is an integer number (39546).

2⁶³⁸¹⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949104).

638190 is an abundant number, since it is smaller than the sum of its proper divisors (1260018).

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

638190 is a wasteful number, since it uses less digits than its factorization.

638190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033 (or 1030 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 638190 is about 798.8679490379. The cubic root of 638190 is about 86.0960707535.

It can be divided in two parts, 638 and 190, that added together give a palindrome (828).

The spelling of 638190 in words is "six hundred thirty-eight thousand, one hundred ninety".