638098 has 4 divisors (see below), whose sum is σ = 957150. Its totient is φ = 319048.

The previous prime is 638081. The next prime is 638117. The reversal of 638098 is 890836.

638098 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 558009 + 80089 = 747^2 + 283^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159523 + ... + 159526.

2⁶³⁸⁰⁹⁸ is an apocalyptic number.

638098 is a deficient number, since it is larger than the sum of its proper divisors (319052).

638098 is a wasteful number, since it uses less digits than its factorization.

638098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319051.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 638098 is about 798.8103654811. The cubic root of 638098 is about 86.0919334176.

The spelling of 638098 in words is "six hundred thirty-eight thousand, ninety-eight".