13820689 has 4 divisors (see below), whose sum is σ = 13874724. Its totient is φ = 13766656.

The previous prime is 13820687. The next prime is 13820713. The reversal of 13820689 is 98602831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98602831 = 421 ⋅234211.

It can be written as a sum of positive squares in 2 ways, for example, as 7102225 + 6718464 = 2665^2 + 2592^2 .

It is a cyclic number.

It is not a de Polignac number, because 13820689 - 2¹ = 13820687 is a prime.

It is a super-2 number, since 2×13820689² = 382022888869442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13820687) 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 3 ways as a sum of consecutive naturals, for example, 26632 + ... + 27145.

It is an arithmetic number, because the mean of its divisors is an integer number (3468681).

Almost surely, 2^13820689 is an apocalyptic number.

It is an amenable number.

13820689 is a deficient number, since it is larger than the sum of its proper divisors (54035).

13820689 is an equidigital number, since it uses as much as digits as its factorization.

13820689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54034.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 13820689 is about 3717.6187270886. The cubic root of 13820689 is about 239.9808375904.

The spelling of 13820689 in words is "thirteen million, eight hundred twenty thousand, six hundred eighty-nine".