123289290 has 80 divisors (see below), whose sum is σ = 349002720. Its totient is φ = 31142880.

The previous prime is 123289277. The next prime is 123289301. The reversal of 123289290 is 92982321.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11385 + ... + 19395.

It is an arithmetic number, because the mean of its divisors is an integer number (4362534).

Almost surely, 2^123289290 is an apocalyptic number.

123289290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123289290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174501360).

123289290 is an abundant number, since it is smaller than the sum of its proper divisors (225713430).

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

123289290 is a wasteful number, since it uses less digits than its factorization.

123289290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8049 (or 8040 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 123289290 is about 11103.5710471902. The cubic root of 123289290 is about 497.7085680547.

The spelling of 123289290 in words is "one hundred twenty-three million, two hundred eighty-nine thousand, two hundred ninety".