123700640 has 96 divisors (see below), whose sum is σ = 351630720. Its totient is φ = 40172544.

The previous prime is 123700597. The next prime is 123700651. The reversal of 123700640 is 46007321.

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, 18374 + ... + 24186.

It is an arithmetic number, because the mean of its divisors is an integer number (3662820).

Almost surely, 2^123700640 is an apocalyptic number.

123700640 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 123700640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175815360).

123700640 is an abundant number, since it is smaller than the sum of its proper divisors (227930080).

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

123700640 is a wasteful number, since it uses less digits than its factorization.

123700640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5854 (or 5846 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 123700640 is about 11122.0789423561. The cubic root of 123700640 is about 498.2614821172.

Adding to 123700640 its reverse (46007321), we get a palindrome (169707961).

The spelling of 123700640 in words is "one hundred twenty-three million, seven hundred thousand, six hundred forty".