13620249 has 6 divisors (see below), whose sum is σ = 19673706. Its totient is φ = 9080160.

The previous prime is 13620223. The next prime is 13620287. The reversal of 13620249 is 94202631.

13620249 is a `hidden beast` number, since 13 + 620 + 24 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7209225 + 6411024 = 2685^2 + 2532^2 .

It is not a de Polignac number, because 13620249 - 2¹¹ = 13618201 is a prime.

It is a super-2 number, since 2×13620249² = 371022365644002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13620149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 756672 + ... + 756689.

It is an arithmetic number, because the mean of its divisors is an integer number (3278951).

Almost surely, 2^13620249 is an apocalyptic number.

It is an amenable number.

13620249 is a deficient number, since it is larger than the sum of its proper divisors (6053457).

13620249 is a wasteful number, since it uses less digits than its factorization.

13620249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513367 (or 1513364 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 13620249 is about 3690.5621523015. The cubic root of 13620249 is about 238.8150445476.

The spelling of 13620249 in words is "thirteen million, six hundred twenty thousand, two hundred forty-nine".