18478434 has 32 divisors (see below), whose sum is σ = 40005504. Its totient is φ = 5656320.

The previous prime is 18478409. The next prime is 18478441. The reversal of 18478434 is 43487481.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18478392 and 18478401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18307 + ... + 19289.

It is an arithmetic number, because the mean of its divisors is an integer number (1250172).

Almost surely, 2^18478434 is an apocalyptic number.

18478434 is an abundant number, since it is smaller than the sum of its proper divisors (21527070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18478434 is a wasteful number, since it uses less digits than its factorization.

18478434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242.

The product of its digits is 86016, while the sum is 39.

The square root of 18478434 is about 4298.6549058979. The cubic root of 18478434 is about 264.3758134766.

The spelling of 18478434 in words is "eighteen million, four hundred seventy-eight thousand, four hundred thirty-four".