18869421 has 16 divisors (see below), whose sum is σ = 26178048. Its totient is φ = 12076800.

The previous prime is 18869393. The next prime is 18869423. The reversal of 18869421 is 12496881.

It is not a de Polignac number, because 18869421 - 2⁷ = 18869293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18869421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18869423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12001 + ... + 13481.

It is an arithmetic number, because the mean of its divisors is an integer number (1636128).

Almost surely, 2^18869421 is an apocalyptic number.

It is an amenable number.

18869421 is a deficient number, since it is larger than the sum of its proper divisors (7308627).

18869421 is a wasteful number, since it uses less digits than its factorization.

18869421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652.

The product of its digits is 27648, while the sum is 39.

The square root of 18869421 is about 4343.8946810437. The cubic root of 18869421 is about 266.2274657470.

The spelling of 18869421 in words is "eighteen million, eight hundred sixty-nine thousand, four hundred twenty-one".