18827047 has 4 divisors (see below), whose sum is σ = 18842800. Its totient is φ = 18811296.

The previous prime is 18827027. The next prime is 18827059. The reversal of 18827047 is 74072881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74072881 = 73 ⋅1014697.

It is a cyclic number.

It is not a de Polignac number, because 18827047 - 2¹¹ = 18824999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18826997 and 18827015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18827027) 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, 5922 + ... + 8527.

It is an arithmetic number, because the mean of its divisors is an integer number (4710700).

Almost surely, 2^18827047 is an apocalyptic number.

18827047 is a deficient number, since it is larger than the sum of its proper divisors (15753).

18827047 is a wasteful number, since it uses less digits than its factorization.

18827047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15752.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 18827047 is about 4339.0145194502. The cubic root of 18827047 is about 266.0280323596.

The spelling of 18827047 in words is "eighteen million, eight hundred twenty-seven thousand, forty-seven".