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642130 = 25157409
BaseRepresentation
bin10011100110001010010
31012121211121
42130301102
5131022010
621432454
75313046
oct2346122
91177747
10642130
113a9495
1226b72a
13196378
1412a026
15ca3da
hex9cc52

642130 has 16 divisors (see below), whose sum is σ = 1166040. Its totient is φ = 254592.

The previous prime is 642121. The next prime is 642133. The reversal of 642130 is 31246.

It can be written as a sum of positive squares in 4 ways, for example, as 576081 + 66049 = 759^2 + 257^2 .

It is not an unprimeable number, because it can be changed into a prime (642133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1366 + ... + 1774.

2642130 is an apocalyptic number.

642130 is a deficient number, since it is larger than the sum of its proper divisors (523910).

642130 is a wasteful number, since it uses less digits than its factorization.

642130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 642130 is about 801.3301441978. The cubic root of 642130 is about 86.2728847767.

Adding to 642130 its reverse (31246), we get a palindrome (673376).

The spelling of 642130 in words is "six hundred forty-two thousand, one hundred thirty".

Divisors: 1 2 5 10 157 314 409 785 818 1570 2045 4090 64213 128426 321065 642130