18139829 has 4 divisors (see below), whose sum is σ = 18215340. Its totient is φ = 18064320.

The previous prime is 18139811. The next prime is 18139859. The reversal of 18139829 is 92893181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92893181 = 547 ⋅169823.

It can be written as a sum of positive squares in 2 ways, for example, as 10876804 + 7263025 = 3298^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 18139829 - 2⁸ = 18139573 is a prime.

It is a super-2 number, since 2×18139829² = 658106792298482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139859) 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, 37394 + ... + 37875.

It is an arithmetic number, because the mean of its divisors is an integer number (4553835).

Almost surely, 2^18139829 is an apocalyptic number.

It is an amenable number.

18139829 is a deficient number, since it is larger than the sum of its proper divisors (75511).

18139829 is an equidigital number, since it uses as much as digits as its factorization.

18139829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75510.

The product of its digits is 31104, while the sum is 41.

The square root of 18139829 is about 4259.0878131356. The cubic root of 18139829 is about 262.7510112964.

The spelling of 18139829 in words is "eighteen million, one hundred thirty-nine thousand, eight hundred twenty-nine".