123031216 has 80 divisors (see below), whose sum is σ = 305337600. Its totient is φ = 46621440.

The previous prime is 123031177. The next prime is 123031217. The reversal of 123031216 is 612130321.

It is a super-2 number, since 2×123031216² = 30273360220877312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123031193 and 123031202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123031217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44235 + ... + 46933.

It is an arithmetic number, because the mean of its divisors is an integer number (3816720).

Almost surely, 2^123031216 is an apocalyptic number.

123031216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123031216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152668800).

123031216 is an abundant number, since it is smaller than the sum of its proper divisors (182306384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123031216 is a wasteful number, since it uses less digits than its factorization.

123031216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762 (or 2756 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 123031216 is about 11091.9437430957. The cubic root of 123031216 is about 497.3610510674.

Adding to 123031216 its reverse (612130321), we get a palindrome (735161537).

The spelling of 123031216 in words is "one hundred twenty-three million, thirty-one thousand, two hundred sixteen".