18803421 has 40 divisors (see below), whose sum is σ = 34584704. Its totient is φ = 9914400.

The previous prime is 18803417. The next prime is 18803423. The reversal of 18803421 is 12430881.

It is not a de Polignac number, because 18803421 - 2² = 18803417 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18803423) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6096 + ... + 8646.

Almost surely, 2^18803421 is an apocalyptic number.

It is an amenable number.

18803421 is a deficient number, since it is larger than the sum of its proper divisors (15781283).

18803421 is a wasteful number, since it uses less digits than its factorization.

18803421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583 (or 2574 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18803421 is about 4336.2911571987. The cubic root of 18803421 is about 265.9167065418.

The spelling of 18803421 in words is "eighteen million, eight hundred three thousand, four hundred twenty-one".