18709829 has 4 divisors (see below), whose sum is σ = 18718560. Its totient is φ = 18701100.

The previous prime is 18709811. The next prime is 18709837. The reversal of 18709829 is 92890781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18709829 - 2⁸ = 18709573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18709829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18709729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304 + ... + 6254.

It is an arithmetic number, because the mean of its divisors is an integer number (4679640).

Almost surely, 2^18709829 is an apocalyptic number.

It is an amenable number.

18709829 is a deficient number, since it is larger than the sum of its proper divisors (8731).

18709829 is an equidigital number, since it uses as much as digits as its factorization.

18709829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8730.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 18709829 is about 4325.4859842566. The cubic root of 18709829 is about 265.4747819426.

The spelling of 18709829 in words is "eighteen million, seven hundred nine thousand, eight hundred twenty-nine".