18484390 has 8 divisors (see below), whose sum is σ = 33271920. Its totient is φ = 7393752.

The previous prime is 18484381. The next prime is 18484391. The reversal of 18484390 is 9348481.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18484391) 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, 924210 + ... + 924229.

It is an arithmetic number, because the mean of its divisors is an integer number (4158990).

Almost surely, 2^18484390 is an apocalyptic number.

18484390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18484390 is a deficient number, since it is larger than the sum of its proper divisors (14787530).

18484390 is a wasteful number, since it uses less digits than its factorization.

18484390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848446.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18484390 is about 4299.3476249310. The cubic root of 18484390 is about 264.4042151113.

The spelling of 18484390 in words is "eighteen million, four hundred eighty-four thousand, three hundred ninety".