123391863 has 32 divisors (see below), whose sum is σ = 210129920. Its totient is φ = 70100640.

The previous prime is 123391861. The next prime is 123391883. The reversal of 123391863 is 368193321.

It is not a de Polignac number, because 123391863 - 2¹ = 123391861 is a prime.

It is a super-2 number, since 2×123391863² = 30451103709221538, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123391861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32406 + ... + 36012.

It is an arithmetic number, because the mean of its divisors is an integer number (6566560).

Almost surely, 2^123391863 is an apocalyptic number.

123391863 is a deficient number, since it is larger than the sum of its proper divisors (86738057).

123391863 is a wasteful number, since it uses less digits than its factorization.

123391863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3804 (or 3798 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 123391863 is about 11108.1890063142. The cubic root of 123391863 is about 497.8465560062.

It can be divided in two parts, 1233 and 91863, that added together give a triangular number (93096 = T₄₃₁).

The spelling of 123391863 in words is "one hundred twenty-three million, three hundred ninety-one thousand, eight hundred sixty-three".