18478011 has 4 divisors (see below), whose sum is σ = 24637352. Its totient is φ = 12318672.

The previous prime is 18477989. The next prime is 18478063. The reversal of 18478011 is 11087481.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18478011 - 2⁷ = 18477883 is a prime.

It is a super-2 number, since 2×18478011² = 682873781032242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18478011.

It is not an unprimeable number, because it can be changed into a prime (18478081) 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, 3079666 + ... + 3079671.

It is an arithmetic number, because the mean of its divisors is an integer number (6159338).

Almost surely, 2^18478011 is an apocalyptic number.

18478011 is a deficient number, since it is larger than the sum of its proper divisors (6159341).

18478011 is an equidigital number, since it uses as much as digits as its factorization.

18478011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6159340.

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 18478011 is about 4298.6057041790. The cubic root of 18478011 is about 264.3737961371.

The spelling of 18478011 in words is "eighteen million, four hundred seventy-eight thousand, eleven".