77841 has 15 divisors (see below), whose sum is σ = 120153. Its totient is φ = 50220.

The previous prime is 77839. The next prime is 77849. The reversal of 77841 is 14877.

77841 = T₂₇₈ + T₂₇₉.

The square root of 77841 is 279.

It is a perfect power (a square), and thus also a powerful number.

77841 is nontrivially palindromic in base 11.

It is not a de Polignac number, because 77841 - 2¹ = 77839 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

77841 is an undulating number in base 11.

77841 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (77849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2496 + ... + 2526.

2⁷⁷⁸⁴¹ is an apocalyptic number.

77841 is the 279-th square number.

77841 is the 140-th centered octagonal number.

It is an amenable number.

77841 is a deficient number, since it is larger than the sum of its proper divisors (42312).

77841 is an equidigital number, since it uses as much as digits as its factorization.

77841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 34 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The cubic root of 77841 is about 42.6975348997.

The spelling of 77841 in words is "seventy-seven thousand, eight hundred forty-one".