18699829 has 2 divisors, whose sum is σ = 18699830. Its totient is φ = 18699828.

The previous prime is 18699823. The next prime is 18699839. The reversal of 18699829 is 92899681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12794929 + 5904900 = 3577^2 + 2430^2 .

It is a cyclic number.

It is not a de Polignac number, because 18699829 - 2²³ = 10311221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18699823) 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 as a sum of consecutive naturals, namely, 9349914 + 9349915.

It is an arithmetic number, because the mean of its divisors is an integer number (9349915).

Almost surely, 2^18699829 is an apocalyptic number.

It is an amenable number.

18699829 is a deficient number, since it is larger than the sum of its proper divisors (1).

18699829 is an equidigital number, since it uses as much as digits as its factorization.

18699829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 52.

The square root of 18699829 is about 4324.3298902836. The cubic root of 18699829 is about 265.4274766656.

The spelling of 18699829 in words is "eighteen million, six hundred ninety-nine thousand, eight hundred twenty-nine".