642194 has 12 divisors (see below), whose sum is σ = 1120734. Its totient is φ = 275184.

The previous prime is 642163. The next prime is 642197. The reversal of 642194 is 491246.

It can be written as a sum of positive squares in only one way, i.e., 582169 + 60025 = 763^2 + 245^2 .

It is not an unprimeable number, because it can be changed into a prime (642197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3179 + ... + 3374.

2⁶⁴²¹⁹⁴ is an apocalyptic number.

642194 is a deficient number, since it is larger than the sum of its proper divisors (478540).

642194 is a wasteful number, since it uses less digits than its factorization.

642194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6569 (or 6562 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 642194 is about 801.3700768060. The cubic root of 642194 is about 86.2757509051.

The spelling of 642194 in words is "six hundred forty-two thousand, one hundred ninety-four".