123217938 has 48 divisors (see below), whose sum is σ = 283880376. Its totient is φ = 38492160.

The previous prime is 123217933. The next prime is 123217943. The reversal of 123217938 is 839712321.

It is an interprime number because it is at equal distance from previous prime (123217933) and next prime (123217943).

It can be written as a sum of positive squares in 4 ways, for example, as 123143409 + 74529 = 11097^2 + 273^2 .

It is not an unprimeable number, because it can be changed into a prime (123217933) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85270 + ... + 86702.

Almost surely, 2^123217938 is an apocalyptic number.

123217938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123217938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141940188).

123217938 is an abundant number, since it is smaller than the sum of its proper divisors (160662438).

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

123217938 is a wasteful number, since it uses less digits than its factorization.

123217938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739 (or 1736 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 123217938 is about 11100.3575618085. The cubic root of 123217938 is about 497.6125355046.

The spelling of 123217938 in words is "one hundred twenty-three million, two hundred seventeen thousand, nine hundred thirty-eight".