18408434 has 8 divisors (see below), whose sum is σ = 30122928. Its totient is φ = 8367460.

The previous prime is 18408431. The next prime is 18408457. The reversal of 18408434 is 43480481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18408434.

It is not an unprimeable number, because it can be changed into a prime (18408431) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 418352 + ... + 418395.

It is an arithmetic number, because the mean of its divisors is an integer number (3765366).

Almost surely, 2^18408434 is an apocalyptic number.

18408434 is a deficient number, since it is larger than the sum of its proper divisors (11714494).

18408434 is a wasteful number, since it uses less digits than its factorization.

18408434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836760.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 18408434 is about 4290.5050984703. The cubic root of 18408434 is about 264.0415549065.

The spelling of 18408434 in words is "eighteen million, four hundred eight thousand, four hundred thirty-four".