18906473 has 4 divisors (see below), whose sum is σ = 19004628. Its totient is φ = 18808320.

The previous prime is 18906467. The next prime is 18906509. The reversal of 18906473 is 37460981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37460981 = 2333 ⋅16057.

It can be written as a sum of positive squares in 2 ways, for example, as 4443664 + 14462809 = 2108^2 + 3803^2 .

It is a cyclic number.

It is not a de Polignac number, because 18906473 - 2⁴ = 18906457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18906443) 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, 48788 + ... + 49173.

It is an arithmetic number, because the mean of its divisors is an integer number (4751157).

Almost surely, 2^18906473 is an apocalyptic number.

It is an amenable number.

18906473 is a deficient number, since it is larger than the sum of its proper divisors (98155).

18906473 is an equidigital number, since it uses as much as digits as its factorization.

18906473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98154.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 18906473 is about 4348.1574258529. The cubic root of 18906473 is about 266.4016065894.

The spelling of 18906473 in words is "eighteen million, nine hundred six thousand, four hundred seventy-three".