977823 has 48 divisors (see below), whose sum is σ = 1886976. Its totient is φ = 472320.

The previous prime is 977819. The next prime is 977831. The reversal of 977823 is 328779.

It is not a de Polignac number, because 977823 - 2² = 977819 is a prime.

It is a super-2 number, since 2×977823² = 1912275638658, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 977823.

It is not an unprimeable number, because it can be changed into a prime (977803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11740 + ... + 11822.

It is an arithmetic number, because the mean of its divisors is an integer number (39312).

2⁹⁷⁷⁸²³ is an apocalyptic number.

977823 is a deficient number, since it is larger than the sum of its proper divisors (909153).

977823 is a wasteful number, since it uses less digits than its factorization.

977823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 121 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 977823 is about 988.8493312937. The cubic root of 977823 is about 99.2552336679.

Adding to 977823 its product of digits (21168), we get a triangular number (998991 = T₁₄₁₃).

It can be divided in two parts, 9778 and 23, that added together give a square (9801 = 99²).

The spelling of 977823 in words is "nine hundred seventy-seven thousand, eight hundred twenty-three".