13620240 has 60 divisors (see below), whose sum is σ = 45743724. Its totient is φ = 3631872.

The previous prime is 13620223. The next prime is 13620287. The reversal of 13620240 is 4202631.

It is a happy number.

13620240 is a `hidden beast` number, since 1 + 3 + 620 + 2 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8088336 + 5531904 = 2844^2 + 2352^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8739 + ... + 10178.

Almost surely, 2^13620240 is an apocalyptic number.

13620240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13620240 is an abundant number, since it is smaller than the sum of its proper divisors (32123484).

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

13620240 is a wasteful number, since it uses less digits than its factorization.

13620240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18936 (or 18927 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 13620240 is about 3690.5609329748. The cubic root of 13620240 is about 238.8149919462.

Adding to 13620240 its reverse (4202631), we get a palindrome (17822871).

The spelling of 13620240 in words is "thirteen million, six hundred twenty thousand, two hundred forty".