18903540 has 24 divisors (see below), whose sum is σ = 52930080. Its totient is φ = 5040928.

The previous prime is 18903517. The next prime is 18903553. The reversal of 18903540 is 4530981.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18903498 and 18903507.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 157470 + ... + 157589.

It is an arithmetic number, because the mean of its divisors is an integer number (2205420).

Almost surely, 2^18903540 is an apocalyptic number.

18903540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18903540 is an abundant number, since it is smaller than the sum of its proper divisors (34026540).

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

18903540 is a wasteful number, since it uses less digits than its factorization.

18903540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315071 (or 315069 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 18903540 is about 4347.8201434742. The cubic root of 18903540 is about 266.3878300675.

The spelling of 18903540 in words is "eighteen million, nine hundred three thousand, five hundred forty".