12123640 has 16 divisors (see below), whose sum is σ = 27278280. Its totient is φ = 4849440.

The previous prime is 12123637. The next prime is 12123647. The reversal of 12123640 is 4632121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151506 + ... + 151585.

Almost surely, 2^12123640 is an apocalyptic number.

12123640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123640 is an abundant number, since it is smaller than the sum of its proper divisors (15154640).

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

12123640 is a wasteful number, since it uses less digits than its factorization.

12123640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303102 (or 303098 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 12123640 is about 3481.9017792006. The cubic root of 12123640 is about 229.7264548827.

Adding to 12123640 its reverse (4632121), we get a palindrome (16755761).

The spelling of 12123640 in words is "twelve million, one hundred twenty-three thousand, six hundred forty".