642098 has 8 divisors (see below), whose sum is σ = 989292. Its totient is φ = 312336.

The previous prime is 642079. The next prime is 642113. The reversal of 642098 is 890246.

It can be written as a sum of positive squares in 2 ways, for example, as 635209 + 6889 = 797^2 + 83^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 642098.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642098.

It is an unprimeable number.

642098 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4265 + ... + 4412.

2⁶⁴²⁰⁹⁸ is an apocalyptic number.

642098 is a deficient number, since it is larger than the sum of its proper divisors (347194).

642098 is a wasteful number, since it uses less digits than its factorization.

642098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8716.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 642098 is about 801.3101771474. The cubic root of 642098 is about 86.2714516410.

The spelling of 642098 in words is "six hundred forty-two thousand, ninety-eight".