123806540 has 96 divisors (see below), whose sum is σ = 310153536. Its totient is φ = 40919040.

The previous prime is 123806537. The next prime is 123806567. The reversal of 123806540 is 45608321.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208484 + ... + 209076.

It is an arithmetic number, because the mean of its divisors is an integer number (3230766).

Almost surely, 2^123806540 is an apocalyptic number.

123806540 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 123806540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155076768).

123806540 is an abundant number, since it is smaller than the sum of its proper divisors (186346996).

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

123806540 is a wasteful number, since it uses less digits than its factorization.

123806540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 123806540 is about 11126.8387244536. The cubic root of 123806540 is about 498.4036286211.

The spelling of 123806540 in words is "one hundred twenty-three million, eight hundred six thousand, five hundred forty".