123898140 has 72 divisors (see below), whose sum is σ = 386267280. Its totient is φ = 32970528.

The previous prime is 123898127. The next prime is 123898199. The reversal of 123898140 is 41898321.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 123898095 and 123898104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 258421 + ... + 258899.

Almost surely, 2^123898140 is an apocalyptic number.

123898140 is a gapful number since it is divisible by the number (10) 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 123898140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193133640).

123898140 is an abundant number, since it is smaller than the sum of its proper divisors (262369140).

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

123898140 is an equidigital number, since it uses as much as digits as its factorization.

123898140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 123898140 is about 11130.9541370001. The cubic root of 123898140 is about 498.5265152845.

The spelling of 123898140 in words is "one hundred twenty-three million, eight hundred ninety-eight thousand, one hundred forty".