18860427 has 12 divisors (see below), whose sum is σ = 27288144. Its totient is φ = 12552720.

The previous prime is 18860423. The next prime is 18860449. The reversal of 18860427 is 72406881.

It is not a de Polignac number, because 18860427 - 2² = 18860423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18860391 and 18860400.

It is not an unprimeable number, because it can be changed into a prime (18860423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5602 + ... + 8312.

It is an arithmetic number, because the mean of its divisors is an integer number (2274012).

Almost surely, 2^18860427 is an apocalyptic number.

18860427 is a deficient number, since it is larger than the sum of its proper divisors (8427717).

18860427 is a wasteful number, since it uses less digits than its factorization.

18860427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490 (or 3487 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18860427 is about 4342.8593115596. The cubic root of 18860427 is about 266.1851604326.

The spelling of 18860427 in words is "eighteen million, eight hundred sixty thousand, four hundred twenty-seven".