18769221 has 6 divisors (see below), whose sum is σ = 27111110. Its totient is φ = 12512808.

The previous prime is 18769183. The next prime is 18769237. The reversal of 18769221 is 12296781.

It can be written as a sum of positive squares in only one way, i.e., 18533025 + 236196 = 4305^2 + 486^2 .

It is not a de Polignac number, because 18769221 - 2⁹ = 18768709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18762221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1042726 + ... + 1042743.

Almost surely, 2^18769221 is an apocalyptic number.

It is an amenable number.

18769221 is a deficient number, since it is larger than the sum of its proper divisors (8341889).

18769221 is a wasteful number, since it uses less digits than its factorization.

18769221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085475 (or 2085472 counting only the distinct ones).

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

The square root of 18769221 is about 4332.3459003177. The cubic root of 18769221 is about 265.7553906728.

The spelling of 18769221 in words is "eighteen million, seven hundred sixty-nine thousand, two hundred twenty-one".