18976221 has 32 divisors (see below), whose sum is σ = 30925440. Its totient is φ = 11404800.

The previous prime is 18976189. The next prime is 18976249. The reversal of 18976221 is 12267981.

It is not a de Polignac number, because 18976221 - 2⁵ = 18976189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18976291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53581 + ... + 53933.

It is an arithmetic number, because the mean of its divisors is an integer number (966420).

Almost surely, 2^18976221 is an apocalyptic number.

18976221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18976221 is a deficient number, since it is larger than the sum of its proper divisors (11949219).

18976221 is a wasteful number, since it uses less digits than its factorization.

18976221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 548 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 18976221 is about 4356.1704512106. The cubic root of 18976221 is about 266.7287992374.

It can be divided in two parts, 1897 and 6221, that added together give a palindrome (8118).

The spelling of 18976221 in words is "eighteen million, nine hundred seventy-six thousand, two hundred twenty-one".