12403240 has 16 divisors (see below), whose sum is σ = 27907380. Its totient is φ = 4961280.

The previous prime is 12403199. The next prime is 12403243. The reversal of 12403240 is 4230421.

It can be written as a sum of positive squares in 2 ways, for example, as 11062276 + 1340964 = 3326^2 + 1158^2 .

It is not an unprimeable number, because it can be changed into a prime (12403243) 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, 155001 + ... + 155080.

Almost surely, 2^12403240 is an apocalyptic number.

12403240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12403240 is an abundant number, since it is smaller than the sum of its proper divisors (15504140).

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

12403240 is a wasteful number, since it uses less digits than its factorization.

12403240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310092 (or 310088 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 12403240 is about 3521.8233913699. The cubic root of 12403240 is about 231.4790630211.

Adding to 12403240 its reverse (4230421), we get a palindrome (16633661).

The spelling of 12403240 in words is "twelve million, four hundred three thousand, two hundred forty".