18803440 has 20 divisors (see below), whose sum is σ = 43718184. Its totient is φ = 7521344.

The previous prime is 18803429. The next prime is 18803471. The reversal of 18803440 is 4430881.

18803440 = 751² + 752² + ... + 782².

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 18803399 and 18803408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117442 + ... + 117601.

Almost surely, 2^18803440 is an apocalyptic number.

18803440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18803440 is an abundant number, since it is smaller than the sum of its proper divisors (24914744).

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

18803440 is a wasteful number, since it uses less digits than its factorization.

18803440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235056 (or 235050 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 18803440 is about 4336.2933480105. The cubic root of 18803440 is about 265.9167961073.

The spelling of 18803440 in words is "eighteen million, eight hundred three thousand, four hundred forty".