123281172 has 144 divisors (see below), whose sum is σ = 377208832. Its totient is φ = 33203520.

The previous prime is 123281143. The next prime is 123281201. The reversal of 123281172 is 271182321.

It is an interprime number because it is at equal distance from previous prime (123281143) and next prime (123281201).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 335733 + ... + 336099.

Almost surely, 2^123281172 is an apocalyptic number.

123281172 is a gapful number since it is divisible by the number (12) 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 123281172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188604416).

123281172 is an abundant number, since it is smaller than the sum of its proper divisors (253927660).

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

123281172 is a wasteful number, since it uses less digits than its factorization.

123281172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 453 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 123281172 is about 11103.2054831026. The cubic root of 123281172 is about 497.6976439189.

The spelling of 123281172 in words is "one hundred twenty-three million, two hundred eighty-one thousand, one hundred seventy-two".