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140689 is a prime number
BaseRepresentation
bin100010010110010001
321010222201
4202112101
514000224
63003201
71124113
oct422621
9233881
10140689
119677a
1269501
134c063
14393b3
152ba44
hex22591

140689 has 2 divisors, whose sum is σ = 140690. Its totient is φ = 140688.

The previous prime is 140683. The next prime is 140717. The reversal of 140689 is 986041.

It is an a-pointer prime, because the next prime (140717) can be obtained adding 140689 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140625 + 64 = 375^2 + 8^2 .

It is a cyclic number.

It is not a de Polignac number, because 140689 - 23 = 140681 is a prime.

It is not a weakly prime, because it can be changed into another prime (140681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70344 + 70345.

It is an arithmetic number, because the mean of its divisors is an integer number (70345).

2140689 is an apocalyptic number.

It is an amenable number.

140689 is a deficient number, since it is larger than the sum of its proper divisors (1).

140689 is an equidigital number, since it uses as much as digits as its factorization.

140689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 140689 is about 375.0853236265. The cubic root of 140689 is about 52.0099832903.

The spelling of 140689 in words is "one hundred forty thousand, six hundred eighty-nine".