123440000 has 80 divisors (see below), whose sum is σ = 307495320. Its totient is φ = 49344000.

The previous prime is 123439999. The next prime is 123440033. The reversal of 123440000 is 44321.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 79229 + ... + 80771.

Almost surely, 2^123440000 is an apocalyptic number.

123440000 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 123440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153747660).

123440000 is an abundant number, since it is smaller than the sum of its proper divisors (184055320).

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

123440000 is an frugal number, since it uses more digits than its factorization.

123440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577 (or 1550 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 123440000 is about 11110.3555298649. The cubic root of 123440000 is about 497.9112867035.

Adding to 123440000 its reverse (44321), we get a palindrome (123484321).

The spelling of 123440000 in words is "one hundred twenty-three million, four hundred forty thousand".