840149 has 2 divisors, whose sum is σ = 840150. Its totient is φ = 840148.

The previous prime is 840139. The next prime is 840163. The reversal of 840149 is 941048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 722500 + 117649 = 850^2 + 343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840149 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420074 + 420075.

It is an arithmetic number, because the mean of its divisors is an integer number (420075).

2⁸⁴⁰¹⁴⁹ is an apocalyptic number.

It is an amenable number.

840149 is a deficient number, since it is larger than the sum of its proper divisors (1).

840149 is an equidigital number, since it uses as much as digits as its factorization.

840149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 840149 is about 916.5964215509. The cubic root of 840149 is about 94.3594581368.

It can be divided in two parts, 840 and 149, that added together give a palindrome (989).

The spelling of 840149 in words is "eight hundred forty thousand, one hundred forty-nine".