18139853 has 4 divisors (see below), whose sum is σ = 18155040. Its totient is φ = 18124668.

The previous prime is 18139811. The next prime is 18139859. The reversal of 18139853 is 35893181.

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 an emirpimes, since its reverse is a distinct semiprime: 35893181 = 59 ⋅608359.

It is a cyclic number.

It is not a de Polignac number, because 18139853 - 2⁶ = 18139789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 6.

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, 5633 + ... + 8246.

It is an arithmetic number, because the mean of its divisors is an integer number (4538760).

Almost surely, 2^18139853 is an apocalyptic number.

It is an amenable number.

18139853 is a deficient number, since it is larger than the sum of its proper divisors (15187).

18139853 is a wasteful number, since it uses less digits than its factorization.

18139853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15186.

The product of its digits is 25920, while the sum is 38.

The square root of 18139853 is about 4259.0906306394. The cubic root of 18139853 is about 262.7511271744.

The spelling of 18139853 in words is "eighteen million, one hundred thirty-nine thousand, eight hundred fifty-three".