18203490 has 48 divisors (see below), whose sum is σ = 47593728. Its totient is φ = 4827168.

The previous prime is 18203483. The next prime is 18203513. The reversal of 18203490 is 9430281.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19617 + ... + 20523.

It is an arithmetic number, because the mean of its divisors is an integer number (991536).

Almost surely, 2^18203490 is an apocalyptic number.

18203490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18203490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23796864).

18203490 is an abundant number, since it is smaller than the sum of its proper divisors (29390238).

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

18203490 is a wasteful number, since it uses less digits than its factorization.

18203490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18203490 is about 4266.5548162423. The cubic root of 18203490 is about 263.0580237940.

The spelling of 18203490 in words is "eighteen million, two hundred three thousand, four hundred ninety".