18603990 has 48 divisors (see below), whose sum is σ = 48584016. Its totient is φ = 4939200.

The previous prime is 18603989. The next prime is 18603997. The reversal of 18603990 is 9930681.

It is a super-2 number, since 2×18603990² = 692216887840200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18603997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37645 + ... + 38135.

It is an arithmetic number, because the mean of its divisors is an integer number (1012167).

Almost surely, 2^18603990 is an apocalyptic number.

18603990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18603990 is an abundant number, since it is smaller than the sum of its proper divisors (29980026).

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

18603990 is a wasteful number, since it uses less digits than its factorization.

18603990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 18603990 is about 4313.2342853131. The cubic root of 18603990 is about 264.9732499402.

The spelling of 18603990 in words is "eighteen million, six hundred three thousand, nine hundred ninety".