123490136 has 64 divisors (see below), whose sum is σ = 290062080. Its totient is φ = 47882880.

The previous prime is 123490123. The next prime is 123490141. The reversal of 123490136 is 631094321.

It is a junction number, because it is equal to n+sod(n) for n = 123490099 and 123490108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188786 + ... + 189438.

It is an arithmetic number, because the mean of its divisors is an integer number (4532220).

Almost surely, 2^123490136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123490136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145031040).

123490136 is an abundant number, since it is smaller than the sum of its proper divisors (166571944).

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

123490136 is a wasteful number, since it uses less digits than its factorization.

123490136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 123490136 is about 11112.6115742430. The cubic root of 123490136 is about 497.9786876037.

The spelling of 123490136 in words is "one hundred twenty-three million, four hundred ninety thousand, one hundred thirty-six".