123420823 has 4 divisors (see below), whose sum is σ = 124102888. Its totient is φ = 122738760.

The previous prime is 123420821. The next prime is 123420853. The reversal of 123420823 is 328024321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123420823 - 2¹ = 123420821 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 (123420821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340761 + ... + 341122.

It is an arithmetic number, because the mean of its divisors is an integer number (31025722).

Almost surely, 2^123420823 is an apocalyptic number.

123420823 is a deficient number, since it is larger than the sum of its proper divisors (682065).

123420823 is an equidigital number, since it uses as much as digits as its factorization.

123420823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682064.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 123420823 is about 11109.4924726560. The cubic root of 123420823 is about 497.8855010607.

The spelling of 123420823 in words is "one hundred twenty-three million, four hundred twenty thousand, eight hundred twenty-three".