13123240 has 32 divisors (see below), whose sum is σ = 31799880. Its totient is φ = 4845312.

The previous prime is 13123237. The next prime is 13123247. The reversal of 13123240 is 4232131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9947716 + 3175524 = 3154^2 + 1782^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12099 + ... + 13138.

Almost surely, 2^13123240 is an apocalyptic number.

13123240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13123240 is an abundant number, since it is smaller than the sum of its proper divisors (18676640).

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

13123240 is a wasteful number, since it uses less digits than its factorization.

13123240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25261 (or 25257 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 13123240 is about 3622.6012753269. The cubic root of 13123240 is about 235.8741548729.

Adding to 13123240 its reverse (4232131), we get a palindrome (17355371).

The spelling of 13123240 in words is "thirteen million, one hundred twenty-three thousand, two hundred forty".