123921863 has 4 divisors (see below), whose sum is σ = 133454328. Its totient is φ = 114389400.

The previous prime is 123921859. The next prime is 123921869. The reversal of 123921863 is 368129321.

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 123921863 - 2² = 123921859 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 (123921869) 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, 4766213 + ... + 4766238.

It is an arithmetic number, because the mean of its divisors is an integer number (33363582).

Almost surely, 2^123921863 is an apocalyptic number.

123921863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123921863 is a deficient number, since it is larger than the sum of its proper divisors (9532465).

123921863 is an equidigital number, since it uses as much as digits as its factorization.

123921863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9532464.

The product of its digits is 15552, while the sum is 35.

The square root of 123921863 is about 11132.0197179128. The cubic root of 123921863 is about 498.5583311772.

The spelling of 123921863 in words is "one hundred twenty-three million, nine hundred twenty-one thousand, eight hundred sixty-three".