102040823 has 4 divisors (see below), whose sum is σ = 102310440. Its totient is φ = 101771208.

The previous prime is 102040801. The next prime is 102040843. The reversal of 102040823 is 328040201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328040201 = 5077 ⋅64613.

It is a cyclic number.

It is not a de Polignac number, because 102040823 - 2¹⁸ = 101778679 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102040795 and 102040804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102040843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134240 + ... + 134997.

It is an arithmetic number, because the mean of its divisors is an integer number (25577610).

Almost surely, 2^102040823 is an apocalyptic number.

102040823 is a deficient number, since it is larger than the sum of its proper divisors (269617).

102040823 is an equidigital number, since it uses as much as digits as its factorization.

102040823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269616.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 102040823 is about 10101.5257758420. The cubic root of 102040823 is about 467.2951973568.

The spelling of 102040823 in words is "one hundred two million, forty thousand, eight hundred twenty-three".