18612473 has 4 divisors (see below), whose sum is σ = 20304528. Its totient is φ = 16920420.

The previous prime is 18612469. The next prime is 18612499. The reversal of 18612473 is 37421681.

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.

It is not a de Polignac number, because 18612473 - 2² = 18612469 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18612413) 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, 846011 + ... + 846032.

It is an arithmetic number, because the mean of its divisors is an integer number (5076132).

Almost surely, 2^18612473 is an apocalyptic number.

It is an amenable number.

18612473 is a deficient number, since it is larger than the sum of its proper divisors (1692055).

18612473 is a wasteful number, since it uses less digits than its factorization.

18612473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692054.

The product of its digits is 8064, while the sum is 32.

The square root of 18612473 is about 4314.2175420347. The cubic root of 18612473 is about 265.0135177630.

It can be divided in two parts, 1861 and 2473, that added together give a palindrome (4334).

The spelling of 18612473 in words is "eighteen million, six hundred twelve thousand, four hundred seventy-three".