140869 has 2 divisors, whose sum is σ = 140870. Its totient is φ = 140868.

The previous prime is 140867. The next prime is 140891. The reversal of 140869 is 968041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 3969 = 370^2 + 63^2 .

It is an emirp because it is prime and its reverse (968041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140869 - 2¹ = 140867 is a prime.

It is a super-2 number, since 2×140869² = 39688150322, which contains 22 as substring.

Together with 140867, it forms a pair of twin primes.

It is a Chen prime.

140869 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140863) 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, 70434 + 70435.

It is an arithmetic number, because the mean of its divisors is an integer number (70435).

2¹⁴⁰⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

140869 is a deficient number, since it is larger than the sum of its proper divisors (1).

140869 is an equidigital number, since it uses as much as digits as its factorization.

140869 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 140869 is about 375.3251923333. The cubic root of 140869 is about 52.0321546690.

The spelling of 140869 in words is "one hundred forty thousand, eight hundred sixty-nine".