638154 has 36 divisors (see below), whose sum is σ = 1524978. Its totient is φ = 192720.

The previous prime is 638147. The next prime is 638159. The reversal of 638154 is 451836.

It can be written as a sum of positive squares in only one way, i.e., 393129 + 245025 = 627^2 + 495^2 .

It is not an unprimeable number, because it can be changed into a prime (638159) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 2032 + ... + 2324.

2⁶³⁸¹⁵⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762489).

638154 is an abundant number, since it is smaller than the sum of its proper divisors (886824).

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

638154 is a wasteful number, since it uses less digits than its factorization.

638154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 309 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 638154 is about 798.8454168361. The cubic root of 638154 is about 86.0944518434.

The spelling of 638154 in words is "six hundred thirty-eight thousand, one hundred fifty-four".