18420867 has 12 divisors (see below), whose sum is σ = 26763984. Its totient is φ = 12208560.

The previous prime is 18420863. The next prime is 18420881. The reversal of 18420867 is 76802481.

It is not a de Polignac number, because 18420867 - 2² = 18420863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18420863) 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, 4359 + ... + 7472.

It is an arithmetic number, because the mean of its divisors is an integer number (2230332).

Almost surely, 2^18420867 is an apocalyptic number.

18420867 is a deficient number, since it is larger than the sum of its proper divisors (8343117).

18420867 is a wasteful number, since it uses less digits than its factorization.

18420867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12010 (or 12007 counting only the distinct ones).

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

The square root of 18420867 is about 4291.9537509158. The cubic root of 18420867 is about 264.1009858148.

The spelling of 18420867 in words is "eighteen million, four hundred twenty thousand, eight hundred sixty-seven".