13818869 has 2 divisors, whose sum is σ = 13818870. Its totient is φ = 13818868.

The previous prime is 13818863. The next prime is 13818887. The reversal of 13818869 is 96881831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 786769 = 3610^2 + 887^2 .

It is an emirp because it is prime and its reverse (96881831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13818869 - 2⁴ = 13818853 is a prime.

It is a super-2 number, since 2×13818869² = 381922280878322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13818863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6909434 + 6909435.

It is an arithmetic number, because the mean of its divisors is an integer number (6909435).

Almost surely, 2^13818869 is an apocalyptic number.

It is an amenable number.

13818869 is a deficient number, since it is larger than the sum of its proper divisors (1).

13818869 is an equidigital number, since it uses as much as digits as its factorization.

13818869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 44.

The square root of 13818869 is about 3717.3739386831. The cubic root of 13818869 is about 239.9703030385.

The spelling of 13818869 in words is "thirteen million, eight hundred eighteen thousand, eight hundred sixty-nine".