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208642 = 2722129
BaseRepresentation
bin110010111100000010
3101121012111
4302330002
523134032
64245534
71526200
oct627402
9347174
10208642
11132835
12a08aa
1373c75
1456070
1541c47
hex32f02

208642 has 12 divisors (see below), whose sum is σ = 364230. Its totient is φ = 89376.

The previous prime is 208631. The next prime is 208657. The reversal of 208642 is 246802.

It can be written as a sum of positive squares in only one way, i.e., 194481 + 14161 = 441^2 + 119^2 .

It is a congruent number.

It is an unprimeable number.

208642 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 5 ways as a sum of consecutive naturals, for example, 967 + ... + 1162.

2208642 is an apocalyptic number.

208642 is a deficient number, since it is larger than the sum of its proper divisors (155588).

208642 is a wasteful number, since it uses less digits than its factorization.

208642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145 (or 2138 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 208642 is about 456.7734668301. The cubic root of 208642 is about 59.3108178117.

The spelling of 208642 in words is "two hundred eight thousand, six hundred forty-two".

Divisors: 1 2 7 14 49 98 2129 4258 14903 29806 104321 208642