123904890 has 160 divisors (see below), whose sum is σ = 358585920. Its totient is φ = 30606336.

The previous prime is 123904889. The next prime is 123904919. The reversal of 123904890 is 98409321.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1277322 + ... + 1277418.

It is an arithmetic number, because the mean of its divisors is an integer number (2241162).

Almost surely, 2^123904890 is an apocalyptic number.

123904890 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 123904890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179292960).

123904890 is an abundant number, since it is smaller than the sum of its proper divisors (234681030).

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

123904890 is a wasteful number, since it uses less digits than its factorization.

123904890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 209 counting only the distinct ones).

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

The square root of 123904890 is about 11131.2573413788. The cubic root of 123904890 is about 498.5355684009.

The spelling of 123904890 in words is "one hundred twenty-three million, nine hundred four thousand, eight hundred ninety".