123215898 has 64 divisors (see below), whose sum is σ = 287667072. Its totient is φ = 34836480.

The previous prime is 123215891. The next prime is 123215909. The reversal of 123215898 is 898512321.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (123215891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55938 + ... + 58098.

It is an arithmetic number, because the mean of its divisors is an integer number (4494798).

Almost surely, 2^123215898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123215898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143833536).

123215898 is an abundant number, since it is smaller than the sum of its proper divisors (164451174).

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

123215898 is a wasteful number, since it uses less digits than its factorization.

123215898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239.

The product of its digits is 34560, while the sum is 39.

The square root of 123215898 is about 11100.2656724963. The cubic root of 123215898 is about 497.6097893266.

The spelling of 123215898 in words is "one hundred twenty-three million, two hundred fifteen thousand, eight hundred ninety-eight".