13122840 has 32 divisors (see below), whose sum is σ = 39368880. Its totient is φ = 3499392.

The previous prime is 13122817. The next prime is 13122841. The reversal of 13122840 is 4822131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13122841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54559 + ... + 54798.

Almost surely, 2^13122840 is an apocalyptic number.

13122840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13122840 is an abundant number, since it is smaller than the sum of its proper divisors (26246040).

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

13122840 is a wasteful number, since it uses less digits than its factorization.

13122840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109371 (or 109367 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13122840 is about 3622.5460659597. The cubic root of 13122840 is about 235.8717583453.

Adding to 13122840 its reverse (4822131), we get a palindrome (17944971).

The spelling of 13122840 in words is "thirteen million, one hundred twenty-two thousand, eight hundred forty".