77423 has 4 divisors (see below), whose sum is σ = 78120. Its totient is φ = 76728.

The previous prime is 77419. The next prime is 77431. The reversal of 77423 is 32477.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32477 = 47 ⋅691.

It is not a de Polignac number, because 77423 - 2² = 77419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77023) 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 in 3 ways as a sum of consecutive naturals, for example, 140 + ... + 417.

It is an arithmetic number, because the mean of its divisors is an integer number (19530).

2⁷⁷⁴²³ is an apocalyptic number.

77423 is a deficient number, since it is larger than the sum of its proper divisors (697).

77423 is a wasteful number, since it uses less digits than its factorization.

77423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696.

The product of its digits is 1176, while the sum is 23.

The square root of 77423 is about 278.2498876909. The cubic root of 77423 is about 42.6209702276.

It can be divided in two parts, 774 and 23, that added together give a palindrome (797).

The spelling of 77423 in words is "seventy-seven thousand, four hundred twenty-three", and thus it is an iban number.