18883821 has 32 divisors (see below), whose sum is σ = 29828736. Its totient is φ = 10496000.

The previous prime is 18883819. The next prime is 18883841. The reversal of 18883821 is 12838881.

It is not a de Polignac number, because 18883821 - 2¹ = 18883819 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18883821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18883841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22591 + ... + 23411.

It is an arithmetic number, because the mean of its divisors is an integer number (932148).

Almost surely, 2^18883821 is an apocalyptic number.

18883821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18883821 is a deficient number, since it is larger than the sum of its proper divisors (10944915).

18883821 is a wasteful number, since it uses less digits than its factorization.

18883821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893.

The product of its digits is 24576, while the sum is 39.

The square root of 18883821 is about 4345.5518636877. The cubic root of 18883821 is about 266.2951714229.

The spelling of 18883821 in words is "eighteen million, eight hundred eighty-three thousand, eight hundred twenty-one".